Question

an echo is heard only if the original sound after reflection should reach the ear in​

Answer 1

Answer:

So the most important condition for hearing an echo is that the reflected sound should reach the ear only after a lapse of at least 0.1 second after the original sound dies off.

Explanation:

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Answer 2

An echo is heard only if the original sound after reflection should reach the ear in 0.1 seconds.

• Echo is defined as the sound which is heard after reflection of sound waves. It can also be defined as the repitition of sound.
• For the echo to be heard, there are two requirements, which are -

1. The minimum distance should be 17 metres between the source of sound and the reflector surface
2. The reflected sound should reach the ear of the hearer within 0.1 seconds.