Assertion :Sound waves do not travel through vacuum Reason: Sound waves are mechanical waves, which require a medium for their propagation

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 mechanical waves and so, sound waves are longitudinal waves. Longitudinal waves vibrate to and fro about mean position through compression and rarefaction. During its motion, the waves give the momentum to the particles of medium and thus it carries energy from one point to another. There are no particles in vacuum, thus sound waves (mechanical waves) cannot transfer energy from one position to another.
Hence sound waves (mechanical waves) require a material medium to travel.
Hence option A is correct.

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Lithium sulphate does not form alums.

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