NEET
- Exam
- NEET
- Subject
- Physics
- Chapter
- Dual Nature of Matter
NEET · Physics · Dual Nature of Matter
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 eV, 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 photoelectron. 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 of 3 eV, cannot eject electrons from a surface with a work function of 5 eV. This is because the energy required to eject an electron (the work function) is 5 eV, but each photon only carries 3 eV. Photons interact with electrons individually, so the combined energy of two photons is irrelevant in this context. Hence, (A) is true.
- Reason (R): The photoelectric effect occurs when a photon with energy greater than the work function strikes the surface. If the photon's energy is less than the work function, no electrons will be emitted, regardless of the number of photons. Therefore, ((\mathrm{R})) is true and correctly explains (A).