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 hospital to break kidney stones of a patient into fine grains which then get flushed out with Urine. The sound similar to that which is produced during an earthquake before the main shock wave is generated.What is the frequency range of sounds like $Z$ ?

20 - 20, 000 H z

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20, 000 - 50, 000 H z

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2 - 10 H z

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all of the above

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Solution

The correct option is A $20 - 20, 000 H z$
Ultrasound is used for removing kidney stones. When ultrasound are targeted on such stone, the stones start vibrating at high frequency. The stone due to this vibratory motion. Breakdown into fine particles. Ultrasounds and infrasounds are not audible to man. Ultrasound have frequency more than $20 k H z .$
Infrasound have frequency below $20 H z$
$X$ is ultrasound.
$Y$ is infrasound
$Z$ is audible sound.
Audible sound has frequency between $20 H z - 20, 000 H z .$

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