Physicshard · Past Paper
A stone is dropped into a well 44.1m deep. The sound of splash is heard 3.13s later. The velocity of sound is:
A330 m/s
B340 m/s
C350 m/s
D320 m/s
✓ Correct Answer: B — 340 m/s
Time to fall = sqrt(2h/g) = 3s. Time for sound = 3.13 - 3 = 0.13s. Speed of sound = 44.1 / 0.13 approx 340 m/s.
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