Name the instrument used in the laboratory to produce sound of a fixed frequency.

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Solution

Tuning fork is used in the laboratory to produce sound of a fixed frequency.

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Three different vibrating objects produce three types of sounds X, Y and Z. Sounds X and Y cannot be heard by a man having normal range of hearing but sound Z can be heard easily. The sound X is used in hospitals to break kidney stones of a patient into fine grains which then get flushed out with urine. The sound Y is similar to that which is produced during an earthquake before the main shock wave is generated.

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