Assertion :Sound waves cannot travel in vacuum but light can travel in vacuum. Reason: Sound waves are longitudinal waves and they cannot be polarised but electromagnetic waves are transverse and they can be polarised.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion Longitudinal waves travel or propagate by compression and rarefaction of the medium particles hence in absence of a medium they cannot propagate. Light waves are made of perpendicular electric and magnetic field vectors normal to direction of motion. Hence, they are transverse waves and if plane of vibration is same for, a wave then it is polarised but this is not so for sound waves.