Physicshard · Past Paper
A sound source produces 40 compressions and 40 rarefactions in 0.4 seconds. What is the frequency of the sound?
A10 Hz
B40 Hz
C100 Hz
D160 Hz
✓ Correct Answer: C — 100 Hz
One wave consists of one compression and one rarefaction. 40 waves in 0.4s means frequency f = 40 / 0.4 = 100 Hz.
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