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Q.

We can hear the sound produced by the humming bees while the sound of vibrations of the pendulum is not heard because:

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a

The sound of humming bees is in the audible range and the vibration of a pendulum is not in the audible range

b

The sound of humming bees is not in the audible range and the vibration of a pendulum is in the audible range

c

The sound of humming bees is not in the audible range and the vibration of a pendulum is in the infrasonic level

d

The sound of humming bees is not in the audible range and the vibration of a pendulum is in the ultrasonic  level

answer is A.

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Detailed Solution

Humans can detect sounds in a frequency range from about 20 Hz to 20 kHz. This is considered an audible range of humans.

Humming bees produce sound by vibrating their wings. The sound produced is in the audible range (20 Hz to 20,000 Hz). 

In the case of the pendulum, the frequency is below 20 Hz which does not fall in the audible range. Our ear is not able to perceive low-frequency vibrations.

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