Question

An echo returned in 4 sec. what is the distance of the reflecting surface from tge surface: ( speed of sound in air is 344m/s)

Answer 1

Answer:

688 m .

Explanation:

Speed of sound, u = 344 m/s

Time taken for hearing the echo, t = 4 s

Distance = Speed * time  

Distance travelled by the sound, u * t = 344 * 4 = 1376 m

So , distance of the reflecting surface from the source = 1376/2 = 688 m

Answer 2

Answer:

688m

Explanation: