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What are periodic changes in pressure that propagate through the air?

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What are periodic changes in pressure that propagate through the air?

(a) Air waves

(b) Sound waves

(c) Rate

(d) None of the mentioned

The question was asked at a job interview.

I'd like to ask this question from Speech Recognition in section Communicating, Perceiving and Acting of Artificial Intelligence

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Correct answer is (b) Sound waves

Explanation: Sound waves are periodic changes in pressure that propagate through the air and it can be measured by a microphone.

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