Question
When sound is reflected from a distant object, an echo is produced and heard in a winter night. Now, if the distance between the reflecting surface and the source of sound production remains the same, will you hear the echo of the same sound on a summer day? Explain.

Answer

No we cannot hear that echo on a summer day as because summer days has huge humidity and thus the air has many particles which act as a barrier for the echo to be reflected fully.
An echo can only be heard if it reaches the ear after 0.1secs.
$\text{Time taken}=\frac{\text{Total distance}}{\text{Velocity}}$
As on a hotter day, the velocity of sound is more, so if the time taken by the echo is less than 0.1sec than it wont be heard.

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