CAIE IGCSE Physics 2.3.3 Radiation Topic Practice

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Covered syllabus points

2.3.3.1—Thermal radiation is infrared2.3.3.2—Thermal energy transfer by thermal2.3.3.3—Effect of surface colour (black or2.3.3.4—For an object to be at a constant2.3.3.5—What happens to an object if the rate2.3.3.6—How the temperature of the Earth is2.3.3.7—Experiments to distinguish between2.3.3.8—Experiments to distinguish between2.3.3.9—Rate of emission of radiation depends

Question 1

[Maximum number: 3]

Fig. 5.1 shows an aluminium block after leaving a furnace in a factory.

Fig. 5.1

Fig. 5.1

Fig. 5.1 shows a factory worker standing 3 m from the block.

State and explain the main process by which thermal energy is transferred to the worker.

Question 2

[Maximum number: 4]

Fig. 6.1 shows a road next to the sea.

Fig. 6.1

Fig. 6.1

Question (a)

(a)

On a sunny day, the Sun warms the road.

Describe how energy from the Sun reaches the Earth and warms the road.

[ 3 ]

Question (b)

(b)

The temperature of the road is greater than the temperature of the sea.

The surface of the road is black.
Suggest one reason why the temperature of the road is greater than that of the sea.

[ 1 ]

Question 3

[Maximum number: 1]

In countries where it is usually hot, houses are often painted white.
What is the reason for this?

A

White surfaces are good reflectors of infrared radiation.

B

White surfaces are good conductors of infrared radiation.

C

White surfaces are good absorbers of infrared radiation.

D

White surfaces are good emitters of infrared radiation.

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