NEET
- Exam
- NEET
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- Physics
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- Atomic Physics
NEET · Physics · Atomic Physics
Given below are two statements: One is labelled as Assertion (A)...
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 \mathrm{~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 \nu \geq \phi), where (\nu) is the frequency of the photon and (\phi) is the work function. Thus, the reason is also true and correctly explains the assertion.
So, both the assertion and the reason are true, and the reason correctly explains the assertion.