Assertion :Nowadays a standard metre is defined as in terms of the speed of light. Reason: Light has no relation with length

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Assertion statement is true that, nowadays,, a standard metre is defined as in terms of the speed of light. But the reason statement is not correct because wavelength of light is used to define metre. So light has a relation with length.
Thus option C is correct.

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