Electromagnetic spectrum — Paper 2 · IGCSE Physics 0625

21 Which row shows the natures of light waves, sound waves and X-rays? light waves sound waves X-rays A longitudinal longitudinal transverse B longitudinal transverse longitudinal C transverse longitudinal transverse D transverse transverse longitudinal

1 marks

Answer: C

This question in 0625/21 May/June 2016

22 Which row shows the natures of light waves, sound waves and X-rays? light waves sound waves X-rays A longitudinal longitudinal transverse B longitudinal transverse longitudinal C transverse longitudinal transverse D transverse transverse longitudinal

1 marks

Answer: C

This question in 0625/22 May/June 2016

24 Visible light has a frequency of approximately 5.0 × 1014 Hz. M and N are two other types of electromagnetic radiation. The frequency of M is 5.0 × 106 Hz. The frequency of N is 5.0 × 1015 Hz. Which types of radiation are M and N? M N A radio waves infra-red B radio waves ultraviolet C ultraviolet X-rays D X-rays infra-red

1 marks

Answer: B

This question in 0625/22 May/June 2016

18 Which row shows the surface that is the better absorber and the surface that is the better emitter of infra-red radiation? better absorber better emitter A black surface black surface B black surface white surface C white surface black surface D white surface white surface

1 marks

Answer: A

This question in 0625/23 May/June 2016

24 Radiation from which part of the electromagnetic spectrum is used in the remote controller for a television? A infra-red waves B microwaves C radio waves D ultraviolet waves

1 marks

Answer: A

This question in 0625/21 Oct/Nov 2016

24 Which part of the electromagnetic spectrum is used to send television signals from a satellite to Earth? A infra-red B microwaves C ultraviolet D visible light

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2016

23 Which description applies to infra-red radiation? A longitudinal and electromagnetic B longitudinal but not electromagnetic C transverse and electromagnetic D transverse but not electromagnetic

1 marks

Answer: C

This question in 0625/23 Oct/Nov 2016

21 Which diagram shows what happens when a ray of white light passes through a prism? A B spectrum white white light light spectrum C D spectrum white white light light spectrum

1 marks

Answer: D

This question in 0625/22 May/June 2017

21 Which diagram shows what happens when a ray of white light passes through a prism? A B spectrum white white light light spectrum C D spectrum white white light light spectrum

1 marks

Answer: D

This question in 0625/23 May/June 2017

23 Visible light, X-rays and microwaves are all components of the electromagnetic spectrum. Which statement about the waves is correct? A In a vacuum, microwaves travel faster than visible light and have a shorter wavelength. B In a vacuum, microwaves travel at the same speed as visible light and have a shorter wavelength. C In a vacuum, X-rays travel faster than visible light and have a shorter wavelength. D In a vacuum, X-rays travel at the same speed as visible light and have a shorter wavelength.

1 marks

Answer: D

This question in 0625/21 Oct/Nov 2017

26 Different waves travel through air. Which waves have the greatest difference in speed? A ultrasound waves and sound waves B ultrasound waves and ultraviolet waves C ultraviolet waves and light waves D ultraviolet waves and radio waves

1 marks

Answer: B

This question in 0625/21 Oct/Nov 2017

23 Which piece of equipment is designed to produce a type of electromagnetic wave? A electric fire B electric generator C electric motor D electromagnet

1 marks

Answer: A

This question in 0625/22 Oct/Nov 2017

24 The Moon is 380 000 km from the Earth. A laser light beam is directed from the Earth to the Moon. The beam is reflected back to the Earth. How long does it take for the light to travel to the Moon and back to the Earth? A 1.27 ms B 2.53 ms C 1.27 s D 2.53 s

1 marks

Answer: D

This question in 0625/22 Oct/Nov 2017

25 Different waves travel through air. Which waves have the greatest difference in speed? A ultrasound waves and sound waves B ultrasound waves and ultraviolet waves C ultraviolet waves and light waves D ultraviolet waves and radio waves

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2017

25 Which statement about radio waves is correct? A They are used in television remote controllers. B They can be detected by the human eye. C They travel as longitudinal waves. D They have the same speed in a vacuum as ultraviolet waves.

1 marks

Answer: D

This question in 0625/23 Oct/Nov 2017

27 Different waves travel through air. Which waves have the greatest difference in speed? A ultrasound waves and sound waves B ultrasound waves and ultraviolet waves C ultraviolet waves and light waves D ultraviolet waves and radio waves

1 marks

Answer: B

This question in 0625/23 Oct/Nov 2017

23 The Sun emits infra-red radiation and light. Light from the Sun reaches the Earth in 8 minutes. Which row gives correct information about the infra-red radiation? wavelength of time taken for infra-red infra-red radiation radiation to reach Earth A longer than wavelength of light 8 minutes B longer than wavelength of light much less than 8 minutes C shorter than wavelength of light 8 minutes D shorter than wavelength of light much more than 8 minutes

1 marks

Answer: A

This question in 0625/21 May/June 2018

23 Which statement is not correct? A The speed of long-wavelength infra-red radiation in a vacuum is greater than that of short- wavelength ultraviolet light. B The speed of microwaves in air is approximately 3.0 × 108 m / s. C The speed of γ-rays emitted from a sample of cobalt-60 is 3.0 × 105 km / s. D The X-rays emitted in a supernova explosion reach the Earth at the same time as the visible light emitted.

1 marks

Answer: A

This question in 0625/22 May/June 2018

24 Different parts of the electromagnetic spectrum are used for different purposes. Below are four statements about parts of the spectrum. statement 1: Infra-red waves are used in television remote controllers. statement 2: Radio waves are used to transmit television pictures from satellites to Earth. statement 3: Ultraviolet waves are used for intruder alarms. statement 4: X-rays are used for security checks. Which statements are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0625/21 Oct/Nov 2018

23 A transmitter produces radio waves of wavelength 1500 m. It takes the waves 0.025 s to travel from the transmitter to a radio receiver. What is the distance between the radio transmitter and the receiver? A 5.0 × 103 m B 2.0 × 105 m C 7.5 × 106 m D 1.1 × 1010 m

1 marks

Answer: C

This question in 0625/22 Oct/Nov 2018

24 Different parts of the electromagnetic spectrum are used for different purposes. Below are four statements about parts of the spectrum. statement 1: Infra-red waves are used in television remote controllers. statement 2: Radio waves are used to transmit television pictures from satellites to Earth. statement 3: Ultraviolet waves are used for intruder alarms. statement 4: X-rays are used for security checks. Which statements are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2018

24 Different parts of the electromagnetic spectrum are used for different purposes. Below are four statements about parts of the spectrum. statement 1: Infra-red waves are used in television remote controllers. statement 2: Radio waves are used to transmit television pictures from satellites to Earth. statement 3: Ultraviolet waves are used for intruder alarms. statement 4: X-rays are used for security checks. Which statements are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: B

This question in 0625/23 Oct/Nov 2018

25 What is the speed of X-rays in a vacuum and in air? in a vacuum in air A 3.0 × 106 m / s 2.0 × 106 m / s B 3.0 × 106 m / s 3.0 × 106 m / s C 3.0 × 108 m / s 2.0 × 108 m / s D 3.0 × 108 m / s 3.0 × 108 m / s

1 marks

Answer: D

This question in 0625/22 Feb/March 2019

23 An eclipse of the Sun happens when the Moon comes between the Earth and the Sun. Which statement is correct? A Infra-red radiation from the Sun disappears before visible light and ultra-violet radiation. B Ultra-violet radiation from the Sun disappears before visible light and infra-red radiation. C Visible light from the Sun disappears before ultra-violet radiation and infra-red radiation. D Infra-red radiation, ultra-violet radiation and visible light from the Sun all disappear at the same moment.

1 marks

Answer: D

This question in 0625/21 May/June 2019

23 An eclipse of the Sun happens when the Moon comes between the Earth and the Sun. Which statement is correct? A Infra-red radiation from the Sun disappears before visible light and ultra-violet radiation. B Ultra-violet radiation from the Sun disappears before visible light and infra-red radiation. C Visible light from the Sun disappears before ultra-violet radiation and infra-red radiation. D Infra-red radiation, ultra-violet radiation and visible light from the Sun all disappear at the same moment.

1 marks

Answer: D

This question in 0625/22 May/June 2019

23 An eclipse of the Sun happens when the Moon comes between the Earth and the Sun. Which statement is correct? A Infra-red radiation from the Sun disappears before visible light and ultra-violet radiation. B Ultra-violet radiation from the Sun disappears before visible light and infra-red radiation. C Visible light from the Sun disappears before ultra-violet radiation and infra-red radiation. D Infra-red radiation, ultra-violet radiation and visible light from the Sun all disappear at the same moment.

1 marks

Answer: D

This question in 0625/23 May/June 2019

39 Which statement about γ-radiation is correct? A It consists of very small charged particles. B It is a form of electromagnetic radiation. C It is less penetrating than β-radiation. D It is more highly ionising than α-radiation.

1 marks

Answer: B

This question in 0625/23 May/June 2019

20 A surface is made so that it is a good source of infrared radiation. Which surface is not suitable? A a surface that is painted matt black B a surface that is painted white C a surface that is heated to a high temperature D a surface that has a large surface area

1 marks

Answer: B

This question in 0625/21 Oct/Nov 2019

21 A large hill blocks the direct path between a transmitter of radio waves and a receiver, as shown. transmitter hill receiver The receiver picks up the signal from the transmitter even though the radio waves do not travel through the hill. Which row is correct? A possible way A stronger signal is for this to happen is received using A diffraction round the hill. longer wavelengths. B diffraction round the hill. shorter wavelengths. C refraction round the hill. longer wavelengths. D refraction round the hill. shorter wavelengths.

1 marks

Answer: A

This question in 0625/21 Oct/Nov 2019

24 The diagram shows the electromagnetic spectrum. radio γ-rays X-rays ultraviolet visible light infrared microwaves waves increasing … A word is missing from the label below the spectrum. Which word is missing? A amplitude B frequency C speed D wavelength

1 marks

Answer: D

This question in 0625/21 Oct/Nov 2019

25 The diagram shows the electromagnetic spectrum. radio γ-rays X-rays ultraviolet visible light infrared microwaves waves increasing … A word is missing from the label below the spectrum. Which word is missing? A amplitude B frequency C speed D wavelength

1 marks

Answer: D

This question in 0625/22 Oct/Nov 2019

21 A large hill blocks the direct path between a transmitter of radio waves and a receiver, as shown. transmitter hill receiver The receiver picks up the signal from the transmitter even though the radio waves do not travel through the hill. Which row is correct? A possible way A stronger signal is for this to happen is received using A diffraction round the hill. longer wavelengths. B diffraction round the hill. shorter wavelengths. C refraction round the hill. longer wavelengths. D refraction round the hill. shorter wavelengths.

1 marks

Answer: A

This question in 0625/23 Oct/Nov 2019

24 The diagram shows the electromagnetic spectrum. radio γ-rays X-rays ultraviolet visible light infrared microwaves waves increasing … A word is missing from the label below the spectrum. Which word is missing? A amplitude B frequency C speed D wavelength

1 marks

Answer: D

This question in 0625/23 Oct/Nov 2019

23 A narrow beam of white light passes through a prism and is dispersed into a spectrum. 1 white 2 light 3 Which row is correct? colour 1 colour 2 colour 3 A blue yellow red B red blue yellow C red yellow blue D yellow blue red

1 marks

Answer: C

This question in 0625/21 May/June 2020

24 An intruder alarm sensor detects that a person is warmer than his surroundings. Which type of electromagnetic wave does the sensor detect? A infrared B radio C ultraviolet D visible light

1 marks

Answer: A

This question in 0625/21 May/June 2020

21 The frequency of the microwaves used in a microwave oven is 2400 MHz. What is the wavelength of these microwaves? A 0.125 m B 8.00 m C 125 m D 7200 m

1 marks

Answer: A

This question in 0625/22 May/June 2020

24 An intruder alarm sensor detects that a person is warmer than his surroundings. Which type of electromagnetic wave does the sensor detect? A infrared B radio C ultraviolet D visible light

1 marks

Answer: A

This question in 0625/22 May/June 2020

24 An intruder alarm sensor detects that a person is warmer than his surroundings. Which type of electromagnetic wave does the sensor detect? A infrared B radio C ultraviolet D visible light

1 marks

Answer: A

This question in 0625/23 May/June 2020

22 A radio transmitter broadcasts at a frequency of 200 kHz. What is the wavelength of these radio waves? A 6.7  10–4 m B 1.5 m C 1.5  103 m D 1.5  106 m

1 marks

Answer: C

This question in 0625/22 Oct/Nov 2020

25 The diagram shows white light passing through a prism. red violet white light Which description of what happens as the light passes into the prism is correct? A The speed of the red light is less than the speed of the violet light and the red light is the least refracted. B The speed of the red light is greater than the speed of the violet light and the red light is the least refracted. C The speed of the violet light is less than the speed of the red light and the violet light is the least refracted. D The speed of the violet light is greater than the speed of the red light and the violet light is the least refracted.

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2020

25 The diagram shows three types of electromagnetic radiation listed in a particular order. The electromagnetic radiation is travelling in a vacuum. microwaves infrared X-rays Which quantities increase in magnitude going from left to right across the list? A frequency only B neither speed nor frequency C speed and frequency D speed only

1 marks

Answer: A

This question in 0625/23 Oct/Nov 2020

25 Which row gives the approximate speeds at which ultraviolet waves travel in air and in a vacuum? speed in air speed in a vacuum m /s m /s A 340 3.0  108 B 340 340 C 3.0  108 340 D 3.0  108 3.0  108

1 marks

Answer: D

This question in 0625/22 Feb/March 2021

25 Here are three statements about the speed of electromagnetic waves. 1 The speed of an electromagnetic wave in a vacuum is 340 m / s. 2 The speed of an electromagnetic wave in a vacuum is 3.0  108 m / s. 3 The speed of an electromagnetic wave in a vacuum is approximately the same as in air. Which statements are correct? A 1 and 3 B 1 only C 2 and 3 D 2 only

1 marks

Answer: C

This question in 0625/22 May/June 2021

22 The Sun emits infrared radiation and light. Light from the Sun reaches the Earth in 8 minutes. Which row gives correct information about the infrared radiation? wavelength of time taken for infrared infrared radiation radiation to reach the Earth A longer than wavelength of light 8 minutes B longer than wavelength of light much less than 8 minutes C shorter than wavelength of light 8 minutes D shorter than wavelength of light much more than 8 minutes

1 marks

Answer: A

This question in 0625/21 Oct/Nov 2021

23 Which list shows regions of the electromagnetic spectrum in order of increasing frequency? A X-ray  ultraviolet  visible light  infrared B X-ray  infrared  visible light  ultraviolet C infrared  visible light  ultraviolet  X-ray D ultraviolet  visible light  infrared  X-ray

1 marks

Answer: C

This question in 0625/21 Oct/Nov 2021

22 The Sun emits infrared radiation and light. Light from the Sun reaches the Earth in 8 minutes. Which row gives correct information about the infrared radiation? wavelength of time taken for infrared infrared radiation radiation to reach the Earth A longer than wavelength of light 8 minutes B longer than wavelength of light much less than 8 minutes C shorter than wavelength of light 8 minutes D shorter than wavelength of light much more than 8 minutes

1 marks

Answer: A

This question in 0625/22 Oct/Nov 2021

23 Which statement about electromagnetic waves is not correct? A They travel at 3  108 m / s in a vacuum. B They transfer energy. C They travel at 340 m / s in air. D They are transverse waves.

1 marks

Answer: C

This question in 0625/22 Oct/Nov 2021

22 The Sun emits infrared radiation and light. Light from the Sun reaches the Earth in 8 minutes. Which row gives correct information about the infrared radiation? wavelength of time taken for infrared infrared radiation radiation to reach the Earth A longer than wavelength of light 8 minutes B longer than wavelength of light much less than 8 minutes C shorter than wavelength of light 8 minutes D shorter than wavelength of light much more than 8 minutes

1 marks

Answer: A

This question in 0625/23 Oct/Nov 2021

25 An eclipse of the Sun happens when the Moon comes between the Earth and the Sun. Which statement is correct? A Infrared radiation from the Sun disappears before visible light and ultraviolet radiation. B Ultraviolet radiation from the Sun disappears before visible light and infrared radiation. C Visible light from the Sun disappears before ultraviolet radiation and infrared radiation. D Infrared radiation, ultraviolet radiation and visible light from the Sun all disappear at the same moment.

1 marks

Answer: D

This question in 0625/22 Feb/March 2022

26 Which part of the electromagnetic spectrum is used by a remote controller for a television? A infrared waves B microwaves C radio waves D visible light

1 marks

Answer: A

This question in 0625/21 May/June 2022

27 Which statement correctly compares radio waves and X-rays? A Radio waves have a longer wavelength and a greater speed in a vacuum. B Radio waves have a longer wavelength and the same speed in a vacuum. C Radio waves have a shorter wavelength and a greater speed in a vacuum. D Radio waves have a shorter wavelength and the same speed in a vacuum.

1 marks

Answer: B

This question in 0625/21 May/June 2022

26 Which type of waves are produced by a television remote controller? A infrared waves B radio waves C ultraviolet waves D visible light

1 marks

Answer: A

This question in 0625/22 May/June 2022

27 Which statement correctly compares radio waves and X-rays? A Radio waves have a longer wavelength and a greater speed in a vacuum. B Radio waves have a longer wavelength and the same speed in a vacuum. C Radio waves have a shorter wavelength and a greater speed in a vacuum. D Radio waves have a shorter wavelength and the same speed in a vacuum.

1 marks

Answer: B

This question in 0625/22 May/June 2022

22 The wavelength of a beam of X-rays, travelling through air, is 5.4 × 10–10 m. What is its frequency? A 5.6 × 10–17 Hz B 5.6 × 1011 Hz C 5.6 × 1017 Hz D 5.6 × 1018 Hz

1 marks

Answer: C

This question in 0625/23 May/June 2022

27 Which statement correctly compares radio waves and X-rays? A Radio waves have a longer wavelength and a greater speed in a vacuum. B Radio waves have a longer wavelength and the same speed in a vacuum. C Radio waves have a shorter wavelength and a greater speed in a vacuum. D Radio waves have a shorter wavelength and the same speed in a vacuum.

1 marks

Answer: B

This question in 0625/23 May/June 2022

30 A student compares the wavelength and uses of infrared waves with microwaves. Which row is correct? wavelength of infrared use of infrared waves compared to microwaves A longer intruder alarms B longer satellite television C shorter intruder alarms D shorter satellite television

1 marks

Answer: C

This question in 0625/23 May/June 2022

23 What is the speed of microwaves in air? A 3  108 m / s B 3  108 cm / s C 3  108 m / s D 3  108 km / s

1 marks

Answer: C

This question in 0625/21 Oct/Nov 2022

16 Which piece of equipment is designed to produce a type of electromagnetic wave? A electric fire B electric generator C electric motor D electromagnet

1 marks

Answer: A

This question in 0625/22 Oct/Nov 2022

24 A 100 m race is started by firing a gun. The gun makes a bang and a puff of smoke at the same time. starter finishing judge 100 m When does the finishing judge see the smoke and when does he hear the bang? sees the smoke hears the bang A almost immediately almost immediately B almost immediately after about 0.3 s C after about 0.3 s almost immediately D after about 0.3 s after about 0.3 s

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2022

16 Which piece of equipment is designed to produce a type of electromagnetic wave? A electric fire B electric generator C electric motor D electromagnet

1 marks

Answer: A

This question in 0625/23 Oct/Nov 2022

23 The speed of light in a vacuum is 3.0  108 m / s. Which value is closest to the speed of light in air? A 3.0  102 m / s B 3.0  104 m / s C 3.0  106 m / s D 3.0  108 m / s

1 marks

Answer: D

This question in 0625/23 Oct/Nov 2022

22 A television (TV) station transmits a signal to a television receiving dish. The television has an on / off indicator light. The television is switched on by a remote control which changes the indicator light from red to green. Which electromagnetic wave used in these actions has the longest wavelength? satellite A receiving dish TV station B TV remote control indicator light red green C D

1 marks

Answer: A

This question in 0625/22 Feb/March 2023

21 Visible light has wavelengths in the range 4.0  10–7 m to 7.0  10–7 m. What is the range of the frequencies of visible light? A 0.12 Hz to 0.21 Hz B 120 Hz to 210 Hz C 4.3  1011 Hz to 7.5  1011 Hz D 4.3  1014 Hz to 7.5  1014 Hz

1 marks

Answer: D

This question in 0625/21 May/June 2023

18 Optical fibres are used to transmit digital signals using infrared radiation. The average refractive index of the fibres is 1.50. Which row describes a digital signal and gives the speed of infrared radiation in the fibres? speed of infrared radiation in the fibres digital signal m / s A a signal that consists 2.0 × 108 of only two values B a signal that consists 4.5 × 108 of only two values C a signal that consists of 2.0 × 108 a continuous range of values D a signal that consists of 4.5 × 108 a continuous range of values

1 marks

Answer: A

This question in 0625/22 May/June 2023

19 Which statement describes monochromatic light? A light of a single frequency B light transmitted by a transparent prism C visible light D white light

1 marks

Answer: A

This question in 0625/22 May/June 2023

21 A radio station broadcasts a signal with a frequency of 89 MHz. What is the wavelength of this signal? A 3.7 µm B 3.4 m C 3.7 km D 3.4 Mm

1 marks

Answer: B

This question in 0625/22 May/June 2023

21 A student writes four statements matching a communication system to the region of the electromagnetic spectrum that it uses to transmit signals. Which statement is correct? A Wireless internet uses visible wavelengths. B Mobile phones use X-rays. C Cable television uses infrared wavelengths. D Bluetooth uses ultraviolet wavelengths.

1 marks

Answer: C

This question in 0625/23 May/June 2023

22 A radio transmitter broadcasts at a frequency of 200 kHz. What is the wavelength of these radio waves? A 6.7  10– 4 m B 1.5 m C 1.5  103 m D 1.5  106 m

1 marks

Answer: C

This question in 0625/21 Oct/Nov 2023

22 The frequency of the microwaves used in a microwave oven is 2400 MHz. What is the wavelength of these microwaves? A 0.125 m B 8.00 m C 125 m D 7200 m

1 marks

Answer: A

This question in 0625/22 Oct/Nov 2023

39 The Sun transfers energy to the Earth through electromagnetic radiation. What are two of the parts of the electromagnetic spectrum to which most of the energy belongs? A gamma rays and X-rays B infrared radiation and visible light C microwaves and visible light D radio waves and microwaves

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2023

19 The diagram shows the effect of a prism on white light. Some light is reflected on striking the prism and some is refracted and dispersed to form a spectrum. reflected light white spectrum light What happens if monochromatic light is used instead of white light? A The light changes colour as it passes through the prism. B The light forms a brighter spectrum. C There is no reflected light. D There is no dispersion of the emerging light.

1 marks

Answer: D

This question in 0625/23 Oct/Nov 2023

37 The Sun radiates most of its energy in three regions of the electromagnetic spectrum. In the pie chart, region 1 is infrared radiation and region 2 is visible radiation. 3 2 1 What is region 3? A microwave B radio C ultraviolet D X-ray

1 marks

Answer: C

This question in 0625/22 Feb/March 2024

21 Which region of the electromagnetic spectrum is used for detecting fake bank notes? A radio B microwaves C ultraviolet D X-rays

1 marks

Answer: C

This question in 0625/21 May/June 2024

22 White light enters a glass prism. The light leaving the other side of the prism is separated into colours. glass glass prism prism white white light colour 1 light colour 1 colour 2 colour 2 diagram 1 diagram 2 Which row correctly describes what happens? path taken colour 1 colour 2 by the light A diagram 1 red violet B diagram 1 violet red C diagram 2 red violet D diagram 2 violet red

1 marks

Answer: C

This question in 0625/22 May/June 2024

23 Thermal radiation is part of the electromagnetic spectrum. What is the name of this region of the spectrum? A gamma rays B infrared C ultraviolet D visible light

1 marks

Answer: B

This question in 0625/22 May/June 2024

24 A remote-controlled vehicle is travelling on the surface of a planet. The vehicle senses an obstacle ahead. It sends a radio message to the control room from where it is being controlled. The control room is 2.4  106 km away from the vehicle. The control room sends a message back to the vehicle telling it to stop. What is the minimum time that elapses between the vehicle sensing the obstacle and receiving the message back from the control room? A 8.0 ms B 16 ms C 8.0 s D 16 s

1 marks

Answer: D

This question in 0625/22 May/June 2024

22 Which colours of visible light are in the correct order of increasing wavelength? A red  yellow  blue B orange  green  violet C indigo  green  red D blue  green  violet

1 marks

Answer: C

This question in 0625/23 May/June 2024

23 The diagram shows three types of electromagnetic radiation listed in a particular order. The electromagnetic radiation is travelling in a vacuum. microwaves infrared X-rays Which quantities increase in magnitude going from left to right across the list? A both speed and frequency B frequency only C speed only D neither speed nor frequency

1 marks

Answer: B

This question in 0625/23 May/June 2024

22 Radio waves are electromagnetic waves. What is the wavelength of a radio wave of frequency 2.0  105 Hz? A 0.00067 m B 0.0015 m C 670 m D 1500 m

1 marks

Answer: D

This question in 0625/21 Oct/Nov 2024

22 What is the speed of electromagnetic waves in a vacuum? A 300 m / s B 300 km / s C 300 000 km / s D 300 000 000 km / s

1 marks

Answer: C

This question in 0625/22 Oct/Nov 2024

22 Which three regions of the electromagnetic spectrum are used in the applications listed? ● sterilising water ● optical fibres ● satellite television signals ● mobile (cell) phones A radio, infrared, visible B ultraviolet, infrared, microwaves C visible, radio, ultraviolet D X-rays, visible, infrared

1 marks

Answer: B

This question in 0625/23 Oct/Nov 2024

22 Satellites are sometimes used to receive and re-transmit television signals. Which row shows the type of satellite and the electromagnetic waves used? electromagnetic type of satellite waves used A low orbit infrared B low orbit microwaves C geostationary infrared D geostationary microwaves

1 marks

Answer: D

This question in 0625/21 May/June 2025

23 What is the approximate speed of light in air? A 300 m / s B 300 km / s C 3.0  108 m / s D 3.0  108 km / s

1 marks

Answer: C

This question in 0625/22 May/June 2025

21 What is the speed of radio waves in a vacuum and what is the speed of gamma rays in a vacuum? speed of radio waves speed of gamma rays A less than 3.0  108 m / s less than 3.0  108 m / s B less than 3.0  108 m / s more than 3.0  108 m / s C 3.0  108 m / s 3.0  108 m / s D more than 3.0  108 m / s more than 3.0  108 m / s

1 marks

Answer: C

This question in 0625/23 May/June 2025

22 Ultraviolet radiation and infrared radiation are both parts of the electromagnetic spectrum. However, they differ in wavelength and frequency. Which row describes how they differ? ultraviolet infrared A longer wavelength higher frequency than infrared than ultraviolet B longer wavelength lower frequency than infrared than ultraviolet C shorter wavelength higher frequency than infrared than ultraviolet D shorter wavelength lower frequency than infrared than ultraviolet

1 marks

Answer: D

This question in 0625/21 Oct/Nov 2025

22 What is the speed of infrared radiation in glass with a refractive index of 1.5? A 340 m / s B 2.0  108 m / s C 3.0  108 m / s D 4.5  108 m / s

1 marks

Answer: B

This question in 0625/22 Oct/Nov 2025

22 Visible light, X-rays and microwaves are all components of the electromagnetic spectrum. Which statement about the waves is correct? A In a vacuum, microwaves travel faster than visible light and have a shorter wavelength than visible light. B In a vacuum, microwaves travel at the same speed as visible light and have a shorter wavelength than visible light. C In a vacuum, X-rays travel faster than visible light and have a shorter wavelength than visible light. D In a vacuum, X-rays travel at the same speed as visible light and have a shorter wavelength than visible light.

1 marks

Answer: D

This question in 0625/23 Oct/Nov 2025

39 The table lists data about four different stars. Which star is the Sun? regions of electromagnetic main elements in the star spectrum where most energy is radiated by the star A helium, hydrogen, carbon, blue, ultraviolet, X-ray nitrogen, oxygen B helium, hydrogen, carbon, red, infrared nitrogen, magnesium C helium, hydrogen infrared, ultraviolet, visible D helium, hydrogen red, infrared

1 marks

Answer: C

This question in 0625/23 Oct/Nov 2025