Chapter - 5 Sound

Q&A -Ask Doubts and Get Answers

Q
Sound

Question:

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? 

Answer:

An echo is heard when the time interval between the reflected sound and the original sound is at least 0.1 seconds. We know, the speed of sound is directly proportional to the temperature of a medium. Hence the time interval is inversely proportional to the temperature of a medium.

As the temperature increases, the speed of sound in a medium also increases. On a hotter day, the time interval between the reflected and original sound will decrease and an echo is audible only if the time interval between the reflected sound and the original sound is greater than 0.1 s.


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