Question

A man stands at a distance of 360 m away from a wall. He shoots a rifle and hears an echo after 1.8s calculate the velocity of sound?​

Answer 1

Answer:

The velocity of the sound is 400 m/s.

Explanation:

The distance between the man and the wall is 360 m. The man hears the echo after 1.8 s. The sound has to travel from the man to the wall and then reflect from the wall to the man. So the sound wave needs to travel a distance of 720 m (360 +360) in total to hear an echo.

The speed of the sound wave is found using the equation,

Speed = distance / time

           = 720 / 1.8

           = 400 m/s

The magnitude of speed is the same as that of the velocity.

∴ Velocity of the sound = 400 m/s