Question

The minimum distance to hear an echo (at 22 deg celsius in air) from a sound reflecting surface is

Answer 1

Hey dear,

◆ Answer-

Minimum distance to hear an echo = 17 m

◆ Explanation-

Sensation of sound persists in human brain for a minimum of 0.1 s, thus fastest echo should get reflected back in that time.

Let s be the minimum distance to hear an echo.

Velocity = 340 m/s

Time = 0.1 s

Distance = 2s

Distance is calculated by-

Distance = Velocity × time

2s = 340 × 0.1

s = 34/2

s = 17 m

Therefore, minimum distance to hear an echo at room temperature is 17 m.

Hope this helps...

Answer 2

Hey mate here is your answer:

The minimum distance to hear an echo (at 22 degree Celsius in air) from a sound reflecting surface is 17.2m .