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Assertion : Soft and hard X-rays differ ...

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 and reason are true and the reason is the correct explanation explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
Soft and hard `X` - rays differ only in frequency . But both types of `X`-ray travel with speed of light.
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