Wavelength and frequency
2 marks · NormalA student uses a ripple tank and counts 30 wave crests passing a fixed point in 10 seconds. What is the frequency of the waves?
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3 Hz (±0.1)
Also accept: 3.0 Hz
Common mistakes: Not dividing by correct time
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Marking points
M1 · 1 mark · Divides number of crests by time to get frequency. (follow-through)
A1 · 1 mark · Gives correct answer: 3 Hz (accept 2.9–3.1 Hz). (follow-through)
Worked solution
Frequency = number of waves / time = 30 / 10 = 3 Hz.