A-LevelPhysicsWaves9702/22 · May/June 2017 · Q57 Marks
Define the frequency of a sound wave.
- (a)Define the frequency of a sound wave.[1]
- (b)A sound wave travels through air. Describe the motion of the air particles relative to the direction of travel of the sound wave.[1]
- (c)(i)Use Fig. 5.1 to determine the frequency of the sound wave.[2]
- (c)(ii) 1.directly towards the stationary microphone,[1]
- (c)(ii) 2.directly away from the stationary microphone.[2]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.
- [B1] frequency is the number of vibrations/oscillations per unit time or the number of wavefronts passing a point per unit time
- [B1] vibrations/oscillation of the air particles are parallel to the direction of it (the direction of travel of the sound wave)
- [C1] T = 2(.0) (ms)
- [A1] f = 500 Hz
- [B3] any 3 points
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