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Wave Speed

Which of the ...

Question

Which of the following cannot produce ultrasonics?

A

galton whistle

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B

quartz crystal.

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C

magnetostriction effect

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D

quincke's tube.

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Solution

The correct option is A quincke's tube.
The quartz crystal, galon whistle and the magnetostriction effect can produce ultrasonic waves of frequency of the order of $M H z$ but quincke's tube cannot.

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