NEETPhysicsAtomic Physics
Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Two photons each of energy 3 (e ~V ), can't eject electrons from a surface of work function 5 eV. Reason (R) : Only a photon of energy greater than work function may emit photo electron. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A).
- BBoth (A) and (R) are true and (R) is NOT the correct explanation of (A).
- C(A) is true but (R) is false.
- D(A) is false but (R) is true.
Correct answer
A. Both (A) and (R) are true and (R) is the correct explanation of (A).
Step-by-step solution
- Assertion (A): Two photons each with energy 3 eV cannot eject electrons from a surface with a work function of 5 eV . This is because in the photoelectric effect, each electron interacts with a single photon, not multiple photons. Thus, a single 3 eV photon does not have enough energy to overcome the 5 eV work function, making the assertion true. - Reason (R): Only a photon with energy greater than the work function can eject an electron from a surface. This is consistent with the photoelectric equation, (h ), wh