What is the least time interval required to hear a distinct echo?

0.3 s

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0.1 s

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0.5 s

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20 s

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Solution

The correct option is B
0.1 s

As the sensation of sound persists in our brain for about 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.

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What is the least time interval required to hear a distinct echo?

The correct option is B 0.1 s As the sensation of sound persists in our brain for about 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.

The correct option is B
0.1 s

As the sensation of sound persists in our brain for about 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.