Minimum time interval for hearing a distinct echo is
A
0.1 s
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B
1.5 s
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C
2.0 s
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D
0.2 s
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Solution
The correct option is A
0.1 s
To hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1s because the brain can interpret distinct sounds after a gap of 0.1 s.