Question

An echo is heard 0.4 seconds after a boy lights a fire cracker 66 m away from a high building calculate the speed of sound

Answer 1

Answer:

An echo is heard 0.4 s after a boy lights a fire cracker 66 m away from a high building.

To find,

Speed of sound.

Solution,

The speed of sound is given by total distance divided by total time taken by the sound. The total distance covered by the sound to receive an echo is 2d. So,

u=2d/t

u=2×66m/0.4s

v=330 m/s

So, the speed of sound is 330 m/s