Q.11.    When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

Answers (1)
D Divya Prakash Singh

Listening to the sound of echo depends upon the time interval between the source of a sound and the reflecting sound which should be at least 0.1 seconds. 

The speed of the sound increases with an increase in the temperature of the medium. Hence, on a hotter day, the time interval between the source sound and the reflected sound will decrease.

Therefore, we cannot listen to the echo unless the interval is greater than 0.1 seconds.