COMEDK · Chemistry · 2. Structure of Atom

In the photoelectric emission, the energy of the emitted electron is:

A greater than the energy of the incident photon
B proportional to the intensity of the incident photon
C same as that of the incident photon
D smaller than the energy of the incident photon

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Answer & Solution

Correct Answer

(D) smaller than the energy of the incident photon

Step-by-step Solution

Detailed explanation

According to Einstein's photoelectric equation, the maximum kinetic energy of the emitted electron is given by: \(K_{\max} = E - \Phi\) where \(E\) is the energy of the incident photon and \(\Phi\) is the work function of the material. Since the work function \(\Phi\) is always…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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