Question

If a person at distance of 34.4 m from cliff makes sound, after how much time he will hear echo?​

Answer 1

Answer:

0.1 seconds

Explanation:

To hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s. If we take the speed of sound to be 344 m/s at a given temperature, say at 22 ºC in air, the sound must go to the obstacle and reach back the ear of the listener on reflection after 0.1s.