Assertion :Ultrasonic waves are longitudinal waves of frequency grater than $20, 000 H z$ Reason: The maximum frequency of audible sound waves is $20, 000 H z$

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Sound waves are always longitudinal in nature.
We humans can hear sounds of maximum frequency of 20,000Hz.
Sounds of frequencies higher than 20,000Hz are out of audible range and cannot be heard by us.
Such waves are known as Ultra-sonic waves.

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