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Question
The graph given here shows the frequency of sound emitted by a source for 30 seconds. For how many seconds a normal human being be able to hear the sound?
The graph given here shows the frequency of sound emitted by a source for 30 seconds. For how many seconds a normal human being be able to hear the sound?
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Solution
The correct option is D 20 s
Audible range for human being is 20 Hz to 20 kHz.
From the graph, the time interval in which a normal human being be able to hear the sound below 20 kHz starts from 5 seconds and end at 25 seconds, beyond this range the sound is above 20 kHz and will not be audible to human beings.
Hence, the duration in which a normal human being be able to hear the sound is 20 s.
Audible range for human being is 20 Hz to 20 kHz.
From the graph, the time interval in which a normal human being be able to hear the sound below 20 kHz starts from 5 seconds and end at 25 seconds, beyond this range the sound is above 20 kHz and will not be audible to human beings.
Hence, the duration in which a normal human being be able to hear the sound is 20 s.
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