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Question
Why do we hear the sound produced by the humming bees while the sound of vibrations of the pendulum is not heard?
Solution
The sound produced by humming bees by vibrating their wings lies in the audible range of hearing for the average human being which is 20 Hz to 20 kHz, so it can be heard.
While the sound of vibrations of the pendulum is less than 20 Hz, so it can not be heard.
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