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Q.

An echo is produced when a sound is reflected from a distant object. Let the distance between the reflecting surface and the source of sound production remains the same. Is it true that we hear echo sounds on a hotter day?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is false.
The speed of sound increases on a hotter day. Thus, sound after reflection can be returned in less than 0.1 sec as human ears are not sensitive to differentiate the sounds at a time interval of less than 0.1 seconds. Therefore, the echo cannot be heard. Hence, the statement is false.
The correct statement would be, we can’t hear echo sounds on a hotter day.
 
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