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How are sound waves with a frequency of 20Hz to 20,000Hz termed?

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How are sound waves with a frequency of 20Hz to 20,000Hz termed?

(a) Inaudible sounds

(b) Infrasonics

(c) Ultrasonics

(d) Audible sound

The question was asked in an interview.

My query is from Reverberation in section Waves of Engineering Physics I

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Best answer
Right answer is (d) Audible sound

The best explanation: Sound waves below the frequency of 20Hz are infrasonics. Sound waves above 20,000Hz are ultrasonics. Both are inaudible. Sound waves between 20Hz to 20,000Hz are audible sounds.

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