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OCR GCSE Combined Science

Topic questions Waves Uses and hazards of electromagnetic waves

Uses and hazards of electromagnetic waves

7 questions · 38 marks · about 45 minutes

Uses and hazards of electromagnetic waves questions

TopicUses and hazards of electromagnetic waves

OCR J250 Uses and hazards of electromagnetic waves 7 questions

Physics Paper 6 June 2025 Foundation tier, Question 3 1 mark

Which electromagnetic wave is used for cooking ?

A Gamma rays

B Infra-red radiation

C Ultraviolet radiation

D X-rays

Question 3, shown as an image
[1]
Reveal mark scheme Mark scheme for question 3

Physics Paper 6 June 2025 Foundation tier, Question 12 5 marks

(a)

All objects emit electromagnetic waves.

Thermal imaging cameras detect some electromagnetic waves. The photograph is a thermal image of an animal taken using a thermal imaging camera at night.

Figure for question 12
(a)(i)

Which type of electromagnetic wave is the animal emitting?

Tick (✓) one box.

Question 12, shown as an image
Question 12, shown as an image
Question 12, shown as an image
[1]
Reveal mark scheme Mark scheme for question 12(a)(i)
(a)(ii)

Why is a human not able to see the animal at night?

[1]
Reveal mark scheme Mark scheme for question 12(a)(ii)
(b)
(b)(i)

State one reason why ultraviolet, X-ray and gamma radiation can be harmful to living things.

[1]
Reveal mark scheme Mark scheme for question 12(b)(i)
(b)(ii)

Ultraviolet, X-ray and gamma radiation are also useful.

Draw one line from each type of electromagnetic wave to a typical use.

Figure for question 12
[2]
Reveal mark scheme Mark scheme for question 12(b)(ii)

Physics Paper 12 June 2025 Higher tier, Question 15 6 marks

(a)

Security markings can be written on items you own. These are written using a fluorescent ink which is only visible under an ultraviolet lamp.

The diagram shows a security code ABCXYZ written on a black surface.

Figure for question 15

Particles inside the atoms in the ink absorb energy from ultraviolet radiation.

The same particles inside the atoms in the ink re-emit the energy as waves in the visible light region of the electromagnetic spectrum.

(a)(i)

Which particles inside the atom absorb ultraviolet radiation and emit visible light?

[1]
Reveal mark scheme Mark scheme for question 15(a)(i)
(a)(ii)

Describe what happens to these particles when they absorb ultraviolet radiation.

[1]
Reveal mark scheme Mark scheme for question 15(a)(ii)
(a)(iii)

Electromagnetic waves with short wavelengths can cause ionisation when absorbed by these particles inside the atom.

Describe the effect ionisation has on the atom.

[2]
Reveal mark scheme Mark scheme for question 15(a)(iii)
(b)

Radio waves and microwaves are both electromagnetic waves.

(b)(i)

Describe the difference in frequency between radio waves and microwaves.

[1]
Reveal mark scheme Mark scheme for question 15(b)(i)
(b)(ii)

Describe one use that radio waves and microwaves have in common.

[1]
Reveal mark scheme Mark scheme for question 15(b)(ii)

Physics Paper 6 November 2021 Foundation tier, Question 15 12 marks

(a)

Radio waves are electromagnetic waves and are used for communications.

(a)(i)

Suggest why gamma rays are not used for communications.

[1]
Reveal mark scheme Mark scheme for question 15(a)(i)
(a)(ii)

Name one other electromagnetic wave that is used for communications.

[1]
Reveal mark scheme Mark scheme for question 15(a)(ii)
(a)(iii)

State one use of this electromagnetic wave in communications.

[1]
Reveal mark scheme Mark scheme for question 15(a)(iii)
(b)

A TV transmitter emits electromagnetic waves with different frequencies.

Table 15.1 gives information about the waves emitted.

Figure for question 15
(b)(i)

Using data from Table 15.1 describe the relationship between frequency and wavelength.

[2]
Reveal mark scheme Mark scheme for question 15(b)(i)
(b)(ii)

How many significant figures are used in each value in Table 15.1 ?

[1]
Reveal mark scheme Mark scheme for question 15(b)(ii)
(b)(iii)

Calculate the speed of the wave ARQ B.

Use the equation: wave speed = frequency × wavelength

Speed =........ m / s

[3]
Reveal mark scheme Mark scheme for question 15(b)(iii)
(c)

A TV transmitter has a useful output energy transfer of 100 kJ in 1 second.

The input energy is 250 kJ in 1 second.

Calculate the efficiency of the TV transmitter.

[3]
Reveal mark scheme Mark scheme for question 15(c)

Physics Paper 12 November 2021 Higher tier, Question 11 12 marks

(a)

Radio waves are electromagnetic waves and are used for communications.

(a)(i)

Suggest why gamma rays are not used for communications.

[1]
Reveal mark scheme Mark scheme for question 11(a)(i)
(a)(ii)

Name one other electromagnetic wave that is used for communications.

[1]
Reveal mark scheme Mark scheme for question 11(a)(ii)
(a)(iii)

State one use of this electromagnetic wave in communications.

[1]
Reveal mark scheme Mark scheme for question 11(a)(iii)
(b)

A TV transmitter emits electromagnetic waves with different frequencies.

Table 11.1 gives information about the waves emitted.

Figure for question 11
(b)(i)

Using data from Table 11.1 describe the relationship between frequency and wavelength.

[2]
Reveal mark scheme Mark scheme for question 11(b)(i)
(b)(ii)

How many significant figures are used in each value in Table 11.1 ?

[1]
Reveal mark scheme Mark scheme for question 11(b)(ii)
(b)(iii)

Calculate the speed of the wave ARQ B.

Use the equation: wave speed = frequency × wavelength

Speed =........ m / s

[3]
Reveal mark scheme Mark scheme for question 11(b)(iii)
(c)

A TV transmitter has a useful output energy transfer of 100 kJ in 1 second.

The input energy is 250 kJ in 1 second.

Calculate the efficiency of the TV transmitter.

[3]
Reveal mark scheme Mark scheme for question 11(c)

Physics Paper 12 November 2020 Higher tier, Question 2 1 mark

Electromagnetic waves have many uses.

Which row in the table is correct?

Electromagnetic wave
Use
AGamma rays
Tanning beds
BMicrowaves Mobile phones
CRadio waves Killing bacteria
DX-rays Optical fibres
Question 2, shown as an image
[1]
Reveal mark scheme Mark scheme for question 2

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