Assertion : `X` - rays can penetrate through the flesh but not through the bones.
Reason : The penetrating power of `X` - rays depends on voltage.

Options

A. If both assertion and reason are true and reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not correct explanation of the assertion.
C. If assertion is true but the reason is false.
D. If both the assertion and reason are false.

Answer

B

Explanation

The penetrating power of `X` - rays depends upon the voltage applied across the tube producing `X` - rays . `X` - rays can pass through matter of lighter elements such as flesh (which is composed of oxygen , hydrogen and carbon) but cannot pass through substances made of heavier elements like bones (which are made of phosphorus and calcium).