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A vibrating particle produces sound. Is it true that no sound is heard when a simple pendulum oscillates in the air?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
The audible range of sound for human beings is

20 Hz - 20 kHz

. Sound waves with frequencies less than audible range are called infrasound. On the other hand, sound waves of frequency

20 Hz

20 kHz

are audible and can be heard. This range of frequency is called the audible range. The human ear cannot hear sounds of frequencies less than

20 Hz

or more than

20 kHz

. Since the frequency of waves produced by the vibrating pendulum is less than

20 Hz

, it is infrasonic and cannot be heard.

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