alleryStart learning →With sound speed 344 m/s and a 0.1 s persistence of hearing, the minimum distance to hear an echo is
A34.4 m
B8.6 m
C17.2 m
D68.8 m
Answer & Solution
Correct answer: C. 17.2 m
Sound must cover 344 x 0.1 = 34.4 m for the round trip, so the wall must be 17.2 m away.
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