Theory: answer each printed part. For drawings, upload a clear photo of your sketch on the supplied figure; show working and units for calculations.
(a)
Red light has frequency 4.7 × 10¹⁴ Hz and travels in air at 3.0 × 10⁸ m/s.
Calculate the wavelength of the red light in air, in metres.
Answer guidance
Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.
[3 marks]
(b)(i)Read question and case materials as text
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Red light has frequency 4.7 × 10¹⁴ Hz and travels in air at 3.0 × 10⁸ m/s.
Fig. 4.1 shows this red light entering a parallel-sided glass block, with incidence 45° and refraction 30°. State what happens to its speed, frequency and wavelength on entry.
Fig. 4.1 shows this red light entering a parallel-sided glass block, with incidence 45° and refraction 30°. State what happens to its speed, frequency and wavelength on entry.
Fig. 4.1
Answer guidance
State A short answer. No explanation is needed, and adding one cannot earn extra marks.
[2 marks]
(b)(ii)
Using the angles in Fig. 4.1, calculate the refractive index of the glass.
Answer guidance
Using You must use the thing it names. An answer that reaches the right value another way may not score.
[3 marks]
(b)(iii)
The ray continues to the block’s lower face and emerges into air. Draw its path through the block and out into air on Fig. 4.1.
Answer guidance
Draw Accuracy is being marked. Use the figure and be precise about position and labels.
[2 marks]
5054/21/O/N/23Cambridge O Level Physics 5054 · Oct/Nov 2023 · Paper 2 variant 1 · Question 4