GCSEPhysics: Combined ScienceOCR GatewayTopic Questions5. Waves in Matter5.3 Wave Interactions

Wave Interactions (OCR Gateway GCSE Physics: Combined Science)

Topic Questions

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13 marks
i)
The projector is connected to the mains power supply. The projector has an earth wire.
State the potential difference between the earth wire and the live wire in normal use.

Potential difference = ........................................................V [1]

ii)
A projector with a plastic case does not need an earth wire.
A projector with a metal case needs an earth wire.

Explain why.

[2]

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2a2 marks
a)
White light is made of different colours.

White light passes through a transparent filter X.

Filter X absorbs green, blue, indigo and violet light.

The light then passes through another transparent filter Y, as shown in Fig. 18.3.

fig-18-3-paper4-june2098-ocr-gcse-physics

Fig. 18.3

The light that leaves filter Y is red.

i)
What colours are transmitted by filter X?

[1]

ii)
What colours are absorbed by filter Y?

[1]

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2b2 marks
b)
A wall is painted red.

When some coloured lights shine on it, the wall appears black.

i)
Explain why.

[1]

ii)
Suggest two different colours of light that would cause the wall to appear black.

...................................................... and ...................................................... [1]

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2c4 marks
c)
An optician uses red and green light to test vision.

Fig. 18.4 is a ray diagram showing red light passing through a lens.

fig-18-4-paper4-june2098-ocr-gcse-physics

Fig. 18.4

i)
Green light passes through the same lens as in Fig. 18.4.

Complete the ray diagram in Fig. 18.5 for green light. The focal point for red light FR is shown.

fig-18-5-paper4-june2098-ocr-gcse-physics-1

Fig. 18.5

[1]

ii)
Explain your answer to (e)(i).

[1]

iii)
Is the lens in Fig. 18.4 and 18.5 suitable for correcting long-sight or short-sight?

Tick (✓) one box.

Long-sight square
Short-sight square

Explain your answer.

[2]

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