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Introduction to Sound Waves

An object vib...

Question

An object vibrates with a frequency of 15 hertz. Which of the following is true?
(a) It produces sound that we can hear.
(b) It does not produce sound.
(c) It produces sound that we cannot hear.
(d) It produces sound that we can hear if we strain our ears.

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Solution

(c) It produces sound that we cannot hear.

Humans can hear sounds in the frequency range 20Hz - 20000Hz.

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