Photoelectric Effect: Einstein's Equation
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: The photoelectric effect does not takes place, if the energy of the incident radiation is less than the work function of a metal.
Reason R: Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal.
In the light of the above statements, choose the most appropriate answer from the options given below.
Show answer and solution
Answer: (b)
- A: if , the electron cannot get enough energy to leave, so no emission. A is correct.
- R: when . R is correct.
- R describes the threshold case ; it does not explain why there is no emission for .
- So the answer is (b) Both correct, R is not the correct explanation of A.