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Question
The echo will be heard if the orginal sound reflected by an obstacle reaches our ears after
The echo will be heard if the orginal sound reflected by an obstacle reaches our ears after
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Solution
The correct option is D 0.1sec
As the sensation of sound persists in our brain for about 0.1 second, to hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1 second.
As the sensation of sound persists in our brain for about 0.1 second, to hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1 second.
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