1.

Assertion : Soft and hard `X`-rays differ in frequency as well as velocity. Reason : The penetrating power of hard `X`- rays is more than the penetrating power of soft `X`-rays.A. If both Assertion `&` Reason are True `&` the Reason is a correct explanation of the Assertion.B. If both Assertion `&` Reason are True but Reason is not a correct explanation of the Assertion.C. If Assertion is True but the Reason is False.D. If both Assertion `&` Reason are False.

Answer» Correct Answer - B


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