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The human ear can distinguish two sounds as separate echoes only if the time gap between them is at least
A0.1 s
B0.01 s
C1.0 s
D10 s
Answer & Solution
Correct answer: A. 0.1 s
1. The persistence of hearing for the human ear is 0.1 second.
2. So the original sound and its echo must be at least 0.1 s apart to be heard separately.
3. A shorter gap blends the two sounds into one.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.71_
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