A-LevelPhysicsWaves9702/21 · Oct/Nov 2020 · Q55 Marks
A progressive wave Y passes a point P. The variation with time t of the displacement x for the wave at P is shown in Fig. 5.1. [Figure 5.1] The wave has a wavelength of 8.0 cm.
- (a)Determine the speed of the wave.[2]
- (b)A second wave Z has wavelength 8.0 cm and amplitude 2.0 mm at point P. Waves Y and Z have the same speed. For the waves at point P, calculate the ratio intensity of wave Z ─────────── intensity of wave Y[3]
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Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [C1] v = λ / T or v = fλ and f = 1/T
- [A1] v = 8.0 × 10-2 / 0.40 = 0.20 m s-1
- [C1] I ∝ A²
- [C1] ratio = 2² / 4²
- [A1] = 0.25
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