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in Physics by (121k points)
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

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1 Answer

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by (121k points)
Correct Answer - D

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