State what will happen in the following cases : A person standing at a distance of 20 m from a wall claps.
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In the question, it is given that the distance traveled by sound is 2×17=34m as it is a reflected or echo sound. The frequency of the clap is 10 Hz. We know that time taken is the inverse of frequency.
Hence, the time taken is calculated as follows.
T=f1=101=0.1seconds.
The velocity or speed of the sound is calculated from the relationship as follows.
Speedofsoundv=TimetakensDistancetraveledm
That is,v=0.1s34m=340m/s.
Hence, the speed of the sound is 340 m/s
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