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A man standing in front of a mountain be...

A man standing in front of a mountain beats a drum at regular intervals. The drumming rate is gradually increased and he finds that echo is not heard distinctly when the rate becomes `40` per minute. He then moves near to the mountain by `90` metres and finds that echo is again not heard distinctly when the drumming rate becomes `60` per minute. Calculate (a) the distance between the mountain and the initial position of the man and (b) the velocity of sound.

A

205 m

B

300 m

C

180 m

D

270 m

Text Solution

Verified by Experts

The correct Answer is:
D
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