Question

A girl standing in front of a wall at a distance of 90 m produces 2 claps per second.
She notices that the sound of his clapping coincides with the echo. The echo is heard only once when clapping is stopped. Calculate the speed of sound.​

Answer 1

Explanation:

here

diatance i.e wave length=90m

frequencg= 2hertz

velocity=?

we know that

v= f×lamda

v=2×90

v= 180

so the speed of sound is 45mls