| Directions (Q. No. 1 to 7): In the following questions, A statement of Assertion is followed by a statement of Reason (R). Mark the correct choice as. |
| Assertion (A): The energy (E) and momentum (p) of a photon are related as p = E/c |
| Reason (R): The photon behaves like a particle. |
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: Energy = \[\operatorname{E}=hc\lambda \] |
| Momentum = \[\operatorname{P}=h/\lambda \] |
| So, \[\operatorname{P}=\operatorname{E}/c\] |
| This is true only when photon has a particle nature. |
| So, assertion and reason both are true and reason properly explains the assertion. |
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