| Assertion (A): X-ray travels with the speed of light. |
| Reason (R): X-ray is an e.m. wave. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
Option [a] is correct. Explanation: Velocity of all electromagnetic wave is \[3\times {{10}^{8}}\] m/s which is the velocity of light. X-ray is an electromagnetic wave. So, it travels with the velocity \[3\times {{10}^{8}}\]m/s which is the velocity of light. So, assertion and reason both are correct and reason properly explains the assertion.
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