A man-standing in front of a vertical wall at a certain distance beats a drum at regular intervals. The drumming rate is gradually increased and he find that the echo is not heard distinctly when the drumming rate becomes 2 beats in 3 seconds. He then moves nearer to the wall by 90m and finds the echo is again not heard when the drumming rate becomes 1 per second. From this data, the velocity of sound must 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 man standing in front of mountain at a certain distance beats a drum at regular intervals. The drumming rate is gradually increased and finds that the echo is not heard distinctly when the rate becomes 40 per minute. If the velocity of sound in air is 340 m/s, then the distance between the man and mountain is

A man standing in front of a mountain at a certain distance beats a drum at refular intervals. He increases the beating rate and 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 the echo is again not heard when the beating rate is 60 per minute. Calculate the velocity of sound and the distance between the mountain and the initial position of the man.

A man stands at a distance of 250 m from a wall. He shoots a rifle and hears the echo after 1.3 seconds. Calculate the velocity of sound.

A boy standing in front of wall at a distance of 85 m produces 2 claps per second. He notices that the sound of his clapping coincides with the echo. The echo is heard only once when clapping is stopped. Calcualte the speed of sound.

A man claps his hands in front of a wall and he hears the echo after 1.6 s . He walks 33 m nearer the wall and hears the echo 1.4 s after clapping. Find the velocity of sound in air.

A man stands before a large wall at a distance of 50.0 m and claps his hands at regular intervals. Initially, the interval is large. He gradually reduces the interval and fixes it at a value when the echo of a clap merges with the next clap. If he has to clap 10 times during every 3 seconds, find the velocity of sound in air.

A man stands before a large wall a large will at a distance of 100.0 m and claps his hands at regular intervals in such way that echo of a clap marges with the next clap. If he claps 5 times during every 3 seconds, find the velocity of sound in air.