Question

A boy standing 100 metre from a tall building clap his hand and hear an echo 0.65 sec later find the speed of sound on in air​

Answer 1

Answer:

307.69m/sec.

Explanation:

Speed of Sound = Distance sound traveled/ time taken by sound to travel that distance.

Since, speed of sound must be constant for both ways, so time sound take from hand to building is equal to the time taken by echo to reach from building to the hands.

So, 100m in 0.65/2 sec.

Speed of Sound = 100/0.325 = 307.69

Answer 2

Explanation:

speed of sound will be 307.69 m/s