Electromagnetic spectrum — Paper 1 · A Level Physics 9702

24 The diagram illustrates part of the electromagnetic spectrum. high visible low 1 2 frequencies frequencies Which labels are correct for the regions marked 1 and 2? 1 2 A infrared X-rays B microwaves X-rays C ultraviolet microwaves D X-rays infrared

1 marks

Answer: D

This question in 9702/11 May/June 2007

27 T is a microwave transmitter placed at a fixed distance from a flat reflecting surface S. S T A small microwave receiver is moved from T towards S and receives signals of alternate maxima and minima of intensity. The distance between one maximum and the next is 15 mm. What is the frequency of the microwaves? A 1.0 × 107 Hz B 2.0 × 107 Hz C 1.0 × 1010 Hz D 2.0 × 1010 Hz

1 marks

Answer: C

This question in 9702/11 Oct/Nov 2008

23 The order of magnitude of the frequency of the longest-wavelength ultraviolet waves can be expressed as 10x Hz. What is the value of x? A 13 B 15 C 17 D 19

1 marks

Answer: B

This question in 9702/11 Oct/Nov 2009

22 The order of magnitude of the frequency of the longest-wavelength ultraviolet waves can be expressed as 10x Hz. What is the value of x? A 13 B 15 C 17 D 19

1 marks

Answer: B

This question in 9702/12 Oct/Nov 2009

22 Electromagnetic waves from an unknown source in space were found to be significantly diffracted when passing through gaps of the order of 10–5 m. Which type of wave are they most likely to be? A radio waves B microwaves C infra-red waves D ultraviolet waves Space for working

1 marks

Answer: C

This question in 9702/11 May/June 2010

23 Electromagnetic waves from an unknown source in space were found to be significantly diffracted when passing through gaps of the order of 10–5 m. Which type of wave are they most likely to be? A radio waves B microwaves C infra-red waves D ultraviolet waves

1 marks

Answer: C

This question in 9702/13 May/June 2010

24 Which value is a possible wavelength for radiation in the ultra-violet region of the electromagnetic spectrum? A 3 × 10–2 m B 3 × 10–5 m C 3 × 10–8 m D 3 × 10–10 m

1 marks

Answer: C

This question in 9702/12 Oct/Nov 2010

26 Which electromagnetic wave would cause the most significant diffraction effect for an atomic lattice of spacing around 10–10 m? A infra-red B microwave C ultraviolet D X-ray

1 marks

Answer: D

This question in 9702/13 Oct/Nov 2010

25 In which order of magnitude are the frequencies of electromagnetic waves in the visible spectrum? A 1012 Hz B 1013 Hz C 1014 Hz D 1015 Hz Space for working

1 marks

Answer: C

This question in 9702/12 May/June 2011

27 P is a source emitting infra-red radiation and Q is a source emitting ultra-violet radiation. The figures in the table are suggested values for the wavelengths emitted by P and Q. Which row is correct? wavelength wavelength emitted by P / m emitted by Q / m A 5 × 10–5 5 × 10–8 B 5 × 10–5 5 × 10–10 C 5 × 10–7 5 × 10–8 D 5 × 10–7 5 × 10–10

1 marks

Answer: A

This question in 9702/11 Oct/Nov 2011

25 Which statement about electromagnetic radiation is correct? A Waves of wavelength 5 × 10–9 m are high-energy gamma rays. B Waves of wavelength 3 × 10–8 m are ultra-violet waves. C Waves of wavelength 5 × 10–7 m are infra-red waves. D Waves of wavelength 9 × 10–7 m are light waves. Space for working

1 marks

Answer: B

This question in 9702/12 Oct/Nov 2011

28 P is a source emitting infra-red radiation and Q is a source emitting ultra-violet radiation. The figures in the table are suggested values for the wavelengths emitted by P and Q. Which row is correct? wavelength wavelength emitted by P / m emitted by Q / m A 5 × 10–5 5 × 10–8 B 5 × 10–5 5 × 10–10 C 5 × 10–7 5 × 10–8 D 5 × 10–7 5 × 10–10

1 marks

Answer: A

This question in 9702/13 Oct/Nov 2011

27 The period of an electromagnetic wave is 1.0 ns. What are the frequency and wavelength of the wave? frequency / Hz wavelength / m A 1.0 3.0 × 108 B 1.0 × 106 300 C 1.0 × 109 0.30 D 1.0 × 1012 3.0 × 10–4

1 marks

Answer: C

This question in 9702/12 May/June 2012

27 What do not travel at the speed of light in a vacuum? A electrons B microwaves C radio waves D X-rays

1 marks

Answer: A

This question in 9702/11 Oct/Nov 2012

31 The diagram shows a cathode-ray oscilloscope display of an electromagnetic wave. 1.0 cm The time base setting is 0.20 µs cm–1. Which statement is correct? A The frequency of the wave is 2.5 MHz and it lies in the radio wave region of the electromagnetic spectrum. B The frequency of the wave is 2.5 MHz and it lies in the microwave region of the electromagnetic spectrum. C The frequency of the wave is 5.0 MHz and it lies in the radio wave region of the electromagnetic spectrum. D The frequency of the wave is 5.0 MHz and it lies in the microwave region of the electromagnetic spectrum.

1 marks

Answer: A

This question in 9702/12 Oct/Nov 2012

26 Which line in the table summarises the change in wave characteristics on going from infra-red to ultraviolet in the electromagnetic spectrum? speed in a frequency vacuum A decreases decreases B decreases remains constant C increases remains constant D increases increases

1 marks

Answer: C

This question in 9702/11 May/June 2013

24 The order of magnitude of the frequency of the shortest wavelength of visible light waves can be expressed as 10x Hz. What is the value of x? A 12 B 13 C 14 D 15 Space for working

1 marks

Answer: D

This question in 9702/12 May/June 2013

22 Which statement about different types of electromagnetic wave is correct? A The frequency of infra-red waves is less than the frequency of blue light. B The frequency of radio waves is greater than the frequency of gamma rays. C The wavelength of red light is less than the wavelength of ultraviolet waves. D The wavelength of X-rays is greater than the wavelength of microwaves.

1 marks

Answer: A

This question in 9702/13 May/June 2013

23 Orange light has a wavelength of 600 nm. What is the frequency of this light? A 180 GHz B 180 Hz C 500 THz D 500 kHz Space for working

1 marks

Answer: C

This question in 9702/13 May/June 2013

24 Electromagnetic waves of wavelength λ and frequency f travel at speed c in a vacuum. What describes the wavelength and speed of electromagnetic waves of frequency f / 2? speed in a wavelength vacuum A λ / 2 c / 2 B λ / 2 c C 2λ c D 2λ 2c

1 marks

Answer: C

This question in 9702/13 May/June 2013

26 Which statement about a light wave and a sound wave is correct? A Both can be polarised. B Both can travel through free space. C Both have a frequency inversely proportional to their wavelength. D Both have an intensity proportional to their amplitude. Space for working

1 marks

Answer: C

This question in 9702/11 Oct/Nov 2013

24 Electromagnetic waves from an unknown source in space were found to be significantly diffracted when passing through gaps of the order of 10–5 m. Which type of wave are they most likely to be? A radio waves B microwaves C infra-red waves D ultraviolet waves

1 marks

Answer: C

This question in 9702/13 Oct/Nov 2013

23 The order of magnitude of the frequency of the longest-wavelength ultraviolet waves can be expressed as 10x Hz. What is the value of x? A 13 B 15 C 17 D 19 Space for working

1 marks

Answer: B

This question in 9702/11 May/June 2014

26 What is the approximate range of frequencies of infra-red radiation? A 1 × 103 Hz to 1 × 109 Hz B 1 × 109 Hz to 1 × 1011 Hz C 1 × 1011 Hz to 1 × 1014 Hz D 1 × 1014 Hz to 1 × 1017 Hz

1 marks

Answer: C

This question in 9702/13 May/June 2014

22 Which statement about electromagnetic radiation is correct? A Waves of wavelength 5 × 10–9 m are high-energy gamma rays. B Waves of wavelength 3 × 10–8 m are ultra-violet waves. C Waves of wavelength 5 × 10–7 m are infra-red waves. D Waves of wavelength 9 × 10–7 m are light waves.

1 marks

Answer: B

This question in 9702/11 Oct/Nov 2014

22 Which statement about electromagnetic radiation is correct? A Waves of wavelength 5 × 10–9 m are high-energy gamma rays. B Waves of wavelength 3 × 10–8 m are ultra-violet waves. C Waves of wavelength 5 × 10–7 m are infra-red waves. D Waves of wavelength 9 × 10–7 m are light waves.

1 marks

Answer: B

This question in 9702/12 Oct/Nov 2014

26 Which statement about waves is correct? A All electromagnetic waves travel at the same speed in a vacuum. B Longitudinal waves can be polarised. C The amplitude of a wave is directly proportional to the energy transferred by the wave. D The frequency of infra-red light is greater than the frequency of ultra-violet light. Space for working

1 marks

Answer: A

This question in 9702/13 Oct/Nov 2014

27 An electromagnetic wave has a wavelength that is numerically of the same order of magnitude as the diameter of a nucleus. In which region of the electromagnetic spectrum does the wave occur? A gamma ray B X-ray C visible light D infra-red

1 marks

Answer: A

This question in 9702/11 May/June 2015

25 Part of a car was damaged by heating when, on a sunny day, the car was left in front of a curved mirrored building which focussed reflected sunlight onto the car. Which statement about sunlight correctly explains this observation? A Sunlight contains infra-red radiation. B Sunlight contains ultraviolet radiation. C Sunlight is a longitudinal progressive wave which carries energy. D Sunlight is a transverse standing wave which carries energy.

1 marks

Answer: A

This question in 9702/11 Oct/Nov 2015

27 P is a source emitting infra-red radiation and Q is a source emitting ultra-violet radiation. The figures in the table are suggested values for the wavelengths emitted by P and Q. Which row is correct? wavelength wavelength emitted by P / m emitted by Q / m A 5 × 10–5 5 × 10–8 B 5 × 10–5 5 × 10–10 C 5 × 10–7 5 × 10–8 D 5 × 10–7 5 × 10–10

1 marks

Answer: A

This question in 9702/12 Oct/Nov 2015

23 Which electromagnetic waves have the wavelengths of 10–2 m, 10–5 m, 10–10 m and 10–13 m? 10–2 m 10–5 m 10–10 m 10–13 m A infra-red microwaves visible light X-rays B microwaves infra-red X-rays gamma rays C microwaves visible light ultraviolet gamma rays D radio waves microwaves ultraviolet X-rays

1 marks

Answer: B

This question in 9702/11 May/June 2016

24 Each of the principal radiations of the electromagnetic spectrum has a range of wavelengths. Which wavelength is correctly linked to its radiation? wavelength radiation / m A 10–9 gamma ray B 10–5 microwave C 10–8 ultraviolet D 10–14 X-ray

1 marks

Answer: C

This question in 9702/12 May/June 2016

23 A beam of red laser light has length 1.0 m. What is the order of magnitude of the number of wavelengths of the red light in 1.0 m? A 104 B 106 C 108 D 1010

1 marks

Answer: B

This question in 9702/13 May/June 2016

23 The table shows the wavelengths of five electromagnetic waves. Which row correctly identifies the principal radiation for each of these wavelengths? 10–14 m 10–10 m 10–6 m 10–2 m 102 m A gamma ray X-ray infra-red microwave radio wave B radio wave microwave infra-red X-ray gamma ray C radio wave microwave ultraviolet infra-red X-ray D X-ray infra-red ultraviolet microwave radio wave

1 marks

Answer: A

This question in 9702/11 Oct/Nov 2016

23 The table shows the wavelengths of five electromagnetic waves. Which row correctly identifies the principal radiation for each of these wavelengths? 10–14 m 10–10 m 10–6 m 10–2 m 102 m A gamma ray X-ray infra-red microwave radio wave B radio wave microwave infra-red X-ray gamma ray C radio wave microwave ultraviolet infra-red X-ray D X-ray infra-red ultraviolet microwave radio wave

1 marks

Answer: A

This question in 9702/13 Oct/Nov 2016

23 Which statement about light waves and sound waves is correct? A Both light waves and sound waves show the Doppler effect. B Light waves can be diffracted but sound waves cannot be diffracted. C Sound waves are transverse waves and light waves are longitudinal waves. D Sound waves can travel in a vacuum but light waves cannot travel in a vacuum.

1 marks

Answer: A

This question in 9702/12 Feb/March 2017

26 M and N are two electromagnetic waves. The ratio wavelength of M = 105. wavelength of N What could M and N be? M N A microwaves visible light B microwaves γ-rays C γ-rays microwaves D visible light microwaves

1 marks

Answer: A

This question in 9702/12 Feb/March 2017

26 Which list shows electromagnetic waves in order of increasing frequency? A radio waves → gamma rays → ultraviolet → infra-red B radio waves → infra-red → ultraviolet → gamma rays C ultraviolet → gamma rays → radio waves → infra-red D ultraviolet → infra-red → radio waves → gamma rays

1 marks

Answer: B

This question in 9702/11 May/June 2017

22 The period of an electromagnetic wave is 1.0 ns. What are the frequency and wavelength of the wave? frequency / Hz wavelength / m A 1.0 3.0 × 108 B 1.0 × 106 300 C 1.0 × 109 0.30 D 1.0 × 1012 3.0 × 10–4

1 marks

Answer: C

This question in 9702/12 May/June 2017

26 Three different electromagnetic waves P, Q and R have the frequencies shown. frequency / Hz P 3 × 1010 Q 3 × 1013 R 6 × 1014 Which row identifies P, Q and R? P Q R A infra-red visible ultraviolet B microwave infra-red visible C ultraviolet X-ray gamma ray D visible ultraviolet X-ray

1 marks

Answer: B

This question in 9702/12 May/June 2017

21 Which statement about electromagnetic waves in a vacuum is correct? A Amplitude is inversely proportional to velocity. B Frequency is inversely proportional to wavelength. C Intensity is proportional to amplitude. D Velocity is proportional to wavelength.

1 marks

Answer: B

This question in 9702/13 May/June 2017

25 Which row shows a correct frequency in Hz for each of the four principal radiations? X-rays ultraviolet microwaves infra-red A 1010 1014 1018 1015 B 1014 1018 1015 1010 C 1015 1010 1014 1018 D 1018 1015 1010 1014

1 marks

Answer: D

This question in 9702/13 May/June 2017

4 What is a typical value of the wavelength of a microwave travelling in a vacuum? A 3 000 000 pm B 30 nm C 30 000 µm D 3000 mm

1 marks

Answer: C

This question in 9702/11 Oct/Nov 2017

26 What is the order of magnitude of the frequencies of electromagnetic waves in the visible spectrum? A 1010 Hz B 1012 Hz C 1014 Hz D 1016 Hz

1 marks

Answer: C

This question in 9702/11 Oct/Nov 2017

26 Orange light in a vacuum has a wavelength of 600 nm. What is the frequency of this light? A 180 Hz B 5.0 × 105 Hz C 1.8 × 1011 Hz D 5.0 × 1014 Hz

1 marks

Answer: D

This question in 9702/12 Oct/Nov 2017

27 Which frequency of electromagnetic radiation could be ultraviolet? A 1.0 × 106 Hz B 1.0 × 109 Hz C 1.0 × 1012 Hz D 1.0 × 1015 Hz

1 marks

Answer: D

This question in 9702/13 Oct/Nov 2017

28 An electromagnetic wave travels in a straight line through a vacuum. The wave has a frequency of 6.0 THz. What is the number of wavelengths in a distance of 1.0 m along the wave? A 5.0 × 10–5 B 2.0 × 101 C 2.0 × 104 D 5.0 × 107

1 marks

Answer: C

This question in 9702/13 Oct/Nov 2017

23 The table lists possible orders of magnitude of the wavelengths of some of the principal radiations of the electromagnetic spectrum. Which row shows the correct orders of magnitude of the wavelengths? wavelength / m microwaves infra-red ultraviolet X-rays A 10–6 10–10 10–12 10–14 B 10–4 10–8 10–10 10–12 C 10–2 10–6 10–8 10–10 D 102 10–4 10–6 10–8

1 marks

Answer: C

This question in 9702/12 Feb/March 2018

25 The diagram shows a cathode-ray oscilloscope display of an electromagnetic wave. 1.0 cm The time base setting is 0.20 µs cm–1. Which statement is correct? A The frequency of the wave is 2.5 MHz and it lies in the microwave region of the electromagnetic spectrum. B The frequency of the wave is 2.5 MHz and it lies in the radio-wave region of the electromagnetic spectrum. C The frequency of the wave is 5.0 MHz and it lies in the microwave region of the electromagnetic spectrum. D The frequency of the wave is 5.0 MHz and it lies in the radio-wave region of the electromagnetic spectrum.

1 marks

Answer: B

This question in 9702/12 Feb/March 2018

21 Which region of the electromagnetic spectrum includes waves with a frequency of 107 MHz? A infra-red waves B radio waves C ultraviolet waves D X-rays

1 marks

Answer: A

This question in 9702/11 May/June 2018

23 What can be deduced from a table of wavelengths of the waves in the electromagnetic spectrum? A Green light has a shorter wavelength than X-rays. B Red light has a shorter wavelength than green light. C The wavelength range for radio waves is less than that for infra-red waves. D The wavelength range for X-rays is less than that for radio waves.

1 marks

Answer: D

This question in 9702/11 May/June 2018

22 Two lasers emit light in a vacuum. One laser emits red light and the other emits green light. Which property of the two laser beams must be different? A amplitude B frequency C intensity D speed

1 marks

Answer: B

This question in 9702/12 May/June 2018

25 Which region of the electromagnetic spectrum has waves of wavelength 1000 times smaller than the wavelength of visible light? A infra-red B microwaves C ultraviolet D X-rays

1 marks

Answer: D

This question in 9702/12 May/June 2018

25 A telescope detects and analyses some electromagnetic radiation of wavelength 2 cm. Which type of telescope is it? A microwave telescope B optical telescope C radio telescope D X-ray telescope

1 marks

Answer: A

This question in 9702/11 Oct/Nov 2018

26 A surveyor’s device emits a pulse of light. The light is reflected from a wall 150 m away. What is the time taken for the pulse to travel from the device to the wall and then back to the device? A 0.05 ns B 0.10 ns C 0.50 µs D 1.0 µs

1 marks

Answer: D

This question in 9702/12 Oct/Nov 2018

25 An electromagnetic wave has a wavelength of 1.0 × 10–7 m. To which region of the electromagnetic spectrum does this wave belong? A infra-red B ultraviolet C visible D X-ray

1 marks

Answer: B

This question in 9702/13 Oct/Nov 2018

26 The diagram shows the principal regions of the electromagnetic spectrum, with some details labelled. The diagram is not to scale. Q 10–10 m wavelength increasing What is a typical order of magnitude of the wavelength of the radiation in region Q? A 10–7 m B 10–5 m C 10–2 m D 100 m

1 marks

Answer: C

This question in 9702/12 Feb/March 2019

27 The electromagnetic spectrum consists of waves with different wavelengths. Which row correctly identifies regions of the electromagnetic spectrum? 10–10 m 10–8 m 10–5 m 10–2 m A microwaves X-rays ultraviolet infrared B infrared microwaves X-rays ultraviolet C microwaves infrared ultraviolet X-rays D X-rays ultraviolet infrared microwaves

1 marks

Answer: D

This question in 9702/12 May/June 2019

25 Infrared laser light is used for the transmission of data along optic fibres. What is a typical wavelength of infrared radiation? A 5 × 10–5 m B 5 × 10–7 m C 2 × 10–9 m D 2 × 10–11 m

1 marks

Answer: A

This question in 9702/13 May/June 2019

25 An electromagnetic wave has a wavelength of 138 pm in a vacuum. To which region of the electromagnetic spectrum does this wave belong? A radio wave B microwave C visible light D X-ray

1 marks

Answer: D

This question in 9702/11 Oct/Nov 2019

24 Two electromagnetic waves have wavelengths of 5.0 × 10–7 m and 5.0 × 10–2 m. Which row identifies the regions of the electromagnetic spectrum to which the waves belong? wavelength wavelength 5.0 × 10–7 m 5.0 × 10–2 m A ultraviolet infrared B visible microwave C ultraviolet microwave D visible infrared

1 marks

Answer: B

This question in 9702/12 Oct/Nov 2019

21 Which statement about light waves and sound waves is not correct? A Light waves and sound waves can both demonstrate the Doppler effect. B Light waves are transverse waves and sound waves are longitudinal waves. C Light waves can be diffracted but sound waves cannot. D Light waves can travel in a vacuum but sound waves cannot.

1 marks

Answer: C

This question in 9702/13 Oct/Nov 2019

25 What is the order of magnitude of the wavelengths of microwaves and X-rays? wavelength of wavelength of microwaves / m X-rays / m A 10–6 103 B 10–2 103 C 10–6 10–10 D 10–2 10–10

1 marks

Answer: D

This question in 9702/12 Feb/March 2020

23 The graph shows the variation with time of the displacement of an electromagnetic wave at a point. displacement 3.0 arbitrary units 0 0 5 10 15 20 25 30 35 40 45 50 55 –3.0 time / µs The wave is travelling in a vacuum. What is the amplitude and what is the wavelength of the wave? amplitude wavelength / arbitrary units / m A 3.0 6000 B 6.0 6000 C 3.0 7500 D 6.0 7500

1 marks

Answer: A

This question in 9702/11 May/June 2020

26 What are the names of the electromagnetic waves that have wavelengths in a vacuum of 100 pm and of 100 µm? wavelength wavelength 100 pm 100 µm A γ-rays infrared B γ-rays red light C X-rays infrared D X-rays red light

1 marks

Answer: C

This question in 9702/11 May/June 2020

26 The table shows the wavelengths of five electromagnetic waves. Which row correctly identifies the principal radiation for each of these wavelengths? 10–14 m 10–10 m 10–6 m 10–2 m 102 m A gamma-ray X-ray infrared microwave radio wave B radio wave microwave infrared X-ray gamma-ray C radio wave microwave ultraviolet infrared X-ray D X-ray infrared ultraviolet microwave radio wave

1 marks

Answer: A

This question in 9702/12 May/June 2020

26 The table lists possible wavelengths of four different electromagnetic waves. Which row is correct? approximate type of wave wavelength / m A infrared 10–5 B radio 10–3 C ultraviolet 10–12 D X-rays 10–7

1 marks

Answer: A

This question in 9702/13 May/June 2020

25 The graph shows how the intensity of electromagnetic radiation emitted from a distant star varies with wavelength. intensity 0 0 100 200 300 400 500 600 700 800 900 1000 wavelength / nm In which region of the electromagnetic spectrum is the radiation of greatest intensity? A infrared B visible light C ultraviolet D X-ray

1 marks

Answer: C

This question in 9702/11 Oct/Nov 2020

26 Part of the electromagnetic spectrum is shown. increasing frequency visible light What is the name of the shaded region and what is the order of magnitude of a wavelength of a wave from this region? wavelength name / m A infrared 10–5 B infrared 10–8 C ultraviolet 10–5 D ultraviolet 10–8

1 marks

Answer: A

This question in 9702/12 Oct/Nov 2020

26 Two satellites in orbit around the Earth are at a constant distance of 100 km apart from each other. Satellite X transmits a microwave pulse towards satellite Y. The pulse takes time T to reach Y. Satellite Y then transmits a pulse of visible light towards satellite X. What is the time taken for the pulse of light to reach X? A 10–5 T B 10–3 T C 10–2 T D T

1 marks

Answer: D

This question in 9702/13 Oct/Nov 2020

25 What is not a possible value for the wavelength of the named electromagnetic waves when it is travelling in a vacuum? electromagnetic wavelength / m wave A γ-rays 3 × 10–13 B X-rays 3 × 10–10 C infrared 3 × 10–6 D microwaves 3 × 10–5

1 marks

Answer: D

This question in 9702/12 Feb/March 2021

25 Microwaves in a vacuum travel at speed X and have wavelength of order of magnitude Y. What are the speed and a possible order of magnitude of wavelength of X-rays in a vacuum? speed wavelength A X 10–8 Y B X 10–4 Y C 104 X Y D 108 X Y

1 marks

Answer: A

This question in 9702/11 May/June 2021

26 Gamma-rays, microwaves, visible light and X-rays are four regions of the electromagnetic spectrum. Which list shows these four regions in order of increasing wavelength? A microwaves  visible light  X-rays  gamma-rays B gamma-rays  X-rays  visible light  microwaves C X-rays  gamma-rays  microwaves  visible light D microwaves  visible light  gamma-rays  X-rays

1 marks

Answer: B

This question in 9702/13 May/June 2021

25 Which radiation could consist of waves of wavelength 0.5 nm? A -rays B ultraviolet C visible light D X-rays

1 marks

Answer: D

This question in 9702/11 Oct/Nov 2021

23 Brief pulses of red, blue and green light are emitted from the Sun at the same time. The pulses travel the same distance to reach Mars. Assume that the pulses travel in a vacuum for the full duration of their journey. In which order would these pulses of light arrive at Mars? A all arrive at the same time B blue first, then green, then red C red first, then blue, then green D red first, then green, then blue

1 marks

Answer: A

This question in 9702/12 Feb/March 2022

25 Which statement about electromagnetic waves is correct? A A wave of wavelength 5.0  10–6 m is invisible to the human eye. B They can all travel at different speeds in free space. C They cannot be polarised. D They consist of vibrating atoms.

1 marks

Answer: A

This question in 9702/11 May/June 2022

25 An electromagnetic wave in free space has a frequency of 2.5  1014 Hz. Which region of the electromagnetic spectrum includes this frequency? A infrared B microwave C ultraviolet D X-ray

1 marks

Answer: A

This question in 9702/12 May/June 2022

25 A telescope detects and analyses some electromagnetic radiation of wavelength 2 cm. Which type of telescope is it? A microwave telescope B optical telescope C radio telescope D X-ray telescope

1 marks

Answer: A

This question in 9702/11 Oct/Nov 2022

25 Two electromagnetic waves have wavelengths of 5.0  10–7 m and 5.0  10–2 m in a vacuum. Which row identifies the regions of the electromagnetic spectrum to which the waves belong? wavelength wavelength 5.0  10–7 m 5.0  10–2 m A ultraviolet infrared B visible microwave C ultraviolet microwave D visible infrared

1 marks

Answer: B

This question in 9702/12 Oct/Nov 2022

22 The period of an electromagnetic wave in a vacuum is 1.0 ns. What are the frequency and wavelength of the wave? frequency / Hz wavelength / m A 1.0 3.0  108 B 1.0  106 300 C 1.0  109 0.30 D 1.0  1012 3.0  10–4

1 marks

Answer: C

This question in 9702/13 Oct/Nov 2022

24 Which microorganisms have a length that is equal to the wavelength in free space of an electromagnetic wave that is visible to the human eye? A algae of length 0.5 m B bacteria of length 5.0 m C fungi of length 50 m D protozoa of length 100 m

1 marks

Answer: A

This question in 9702/13 Oct/Nov 2022

23 What is the approximate range of frequencies of electromagnetic radiation visible to the human eye? A (430–750) kHz B (430–750) MHz C (430–750) GHz D (430–750) THz

1 marks

Answer: D

This question in 9702/12 Feb/March 2023

23 Some sources of electromagnetic waves in free space are listed. 1 a radio wave transmitter 2 a source of X-rays 3 a 30 mm wavelength radar transmitter 4 a light-emitting diode that emits red light Which list gives the sources in order of increasing wavelength, from left to right, of the waves emitted by the sources? A 1  3  4  2 B 2  4  1  3 C 2  4  3  1 D 3  1  4  2

1 marks

Answer: C

This question in 9702/11 May/June 2023

23 A beam of visible light is in a vacuum. What could be the frequency of the light? A 5.0  105 Hz B 5.0  108 Hz C 5.0  1011 Hz D 5.0  1014 Hz

1 marks

Answer: D

This question in 9702/12 May/June 2023

23 An electromagnetic wave has a wavelength of 2.1 cm in a vacuum. Which region of the electromagnetic spectrum contains this wave? A infrared B microwave C radio wave D visible light

1 marks

Answer: B

This question in 9702/13 May/June 2023

23 A student is investigating two electromagnetic waves, X and Y, in a vacuum. Wave X has a wavelength of 5.2 × 10–7 m. Wave Y has a frequency of 9.4 GHz. Which principal regions of the electromagnetic spectrum contain waves X and Y? X Y A radio wave ultraviolet B ultraviolet visible C visible microwave D microwave radio wave

1 marks

Answer: C

This question in 9702/12 Oct/Nov 2023

1 What is the best estimate of the wavelength of green light? A 260 nm B 540 nm C 780 nm D 920 nm

1 marks

Answer: B

This question in 9702/13 Oct/Nov 2023

23 Which statement about electromagnetic waves in a vacuum is correct? A Amplitude is inversely proportional to velocity. B Frequency is inversely proportional to wavelength. C Intensity is proportional to amplitude. D Velocity is proportional to wavelength.

1 marks

Answer: B

This question in 9702/13 Oct/Nov 2023

25 An electromagnetic wave is travelling through a vacuum. What could be the wavelength and period of the electromagnetic wave? wavelength period A 1.2  10–10 Tm 2.5 Ms B 1.2 pm 2.5  1011 Gs C 1.2  102 pm 4.0  10–10 ns D 1.2  103 m 4.0 ns

1 marks

Answer: C

This question in 9702/11 May/June 2024

25 An electromagnetic wave has a wavelength of 138 pm in a vacuum. To which region of the electromagnetic spectrum does this wave belong? A radio wave B microwave C visible light D X-ray

1 marks

Answer: D

This question in 9702/13 May/June 2024

25 Which group of electromagnetic waves is arranged in order from shortest wavelength to longest wavelength? A radio waves  visible light  gamma rays B visible light  microwaves  infrared C visible light  ultraviolet  X-rays D X-rays  infrared  microwaves

1 marks

Answer: D

This question in 9702/11 Oct/Nov 2024

25 An electromagnetic wave in free space has a frequency of 3.0  1016 Hz. Which row gives the principal region of this wave and an example of an electromagnetic wave with a lower frequency? wave with lower principal region frequency A infrared visible light B infrared X-rays C ultraviolet visible light D ultraviolet X-rays

1 marks

Answer: C

This question in 9702/12 Oct/Nov 2024

25 Each of the principal radiations of the electromagnetic spectrum has a range of wavelengths. Which wavelength is correctly linked to its radiation? wavelength / m radiation A 10–9 gamma ray B 10–5 microwave C 10–8 ultraviolet D 10–14 X-ray

1 marks

Answer: C

This question in 9702/13 Oct/Nov 2024

22 Which row correctly identifies the properties of all electromagnetic waves? transverse | longitudinal can travel wave wave in free space A v x v B v x x Cc x v v D x v x key / = property of an electromagnetic wave X = not a property of an electromagnetic wave

1 marks

Answer: A

This question in 9702/12 Feb/March 2025

23 What is the approximate range of wavelengths in free space for infrared radiation? A 100 nm to 400 nm B 300 m to 30 cm C 400 nm to 700 nm D 800 nm to 1000 m

1 marks

Answer: D

This question in 9702/12 Feb/March 2025

27 Which wavelength of electromagnetic radiation in free space could be green light? A 4.9  10–9 m B 6.6  10–9 m C 5.5  10–7 m D 8.6  10–7 m

1 marks

Answer: C

This question in 9702/11 May/June 2025

24 A teacher removes the turntable from a microwave oven and places a bar of chocolate in the oven. She then switches the oven on for a short time. A stationary wave is formed in the oven. When the chocolate is removed, the teacher observes that there are two small sections of melted chocolate 6.0 cm apart with unmelted chocolate in between. Each section of melted chocolate is located at an antinode. melted chocolate 6.0 cm Assume that the speed of the microwaves is 3.0  108 m s–1. What is the frequency of the microwaves emitted by the oven? A 25 MHz B 50 MHz C 2.5 GHz D 5.0 GHz

1 marks

Answer: C

This question in 9702/12 May/June 2025

27 An electromagnetic wave travelling in free space is not visible to the human eye. What is a possible wavelength of the wave? A 4.5  10–10 km B 6.2  10–7 m C 5.4  10–6 cm D 4.2  10–4 mm

1 marks

Answer: C

This question in 9702/13 May/June 2025

23 Which row could describe electromagnetic waves? type of wave speed in free space A longitudinal faster for shorter wavelengths B longitudinal the same for all wavelengths C transverse faster for shorter wavelengths D transverse the same for all wavelengths

1 marks

Answer: D

This question in 9702/14 May/June 2025

25 Which statement about electromagnetic waves is correct? A A wave of wavelength 5.0  10–6 m is invisible to the human eye. B They can all travel at different speeds in free space. C They cannot be polarised. D They consist of vibrating atoms.

1 marks

Answer: A

This question in 9702/14 Oct/Nov 2025