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Q.

We hear the sound produced by the humming bees while the sound of vibrations of a pendulum is not heard because the range of hearing of humans is


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a

20 Hz to 20000 Hz

b

5 Hz to 15 Hz

c

<20 Hz

d

10 Hz 

answer is A.

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Detailed Solution

The range of hearing of humans is 20 Hz to 20000 Hz.
Generally, humans perceive a frequency range between 20 Hz to 20000 Hz, and below that, the sounds are called infrasound which is inaudible to human ears. Usually, humming bees produce sounds by vibrating their wings, and the sound produced is in the range of 20 Hz to 20000 Hz which is audible to humans, but the sound produced by the pendulum is below 20 Hz, which does not come in the audible range.
 
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