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         A man standing in front of a mountain beats a drum at regular intervals. The rate of drumming is generally increased and he finds that the echo is not heard distinctly when the rate becomes 40 per minute. He then moves nearer to the mountain by 90 m and finds that echo is again not heard when the drumming rate becomes 60 per minute. Find the velocity of sound?
one month ago

Arun
15947 Points
							For not hearing the echo the time interval between the beats of drum must be equal to time of echo.                    Þ t1=2dv=6040=32                 ...... (i)                    and t2=2(d−90)v=6060=1                    Þ 2d−180=v                   ...... (ii)                    Form (i), we get2d=32v. Substituting in (ii), we get                    Þ 32v−180=v Þ 180=v2 Þ v=360ms−1                    Þ 2(d)360=32 Þ d=270m.

one month ago
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## COUPON CODE: SELF10

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### Course Features

• 141 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions