AP EAMCET · Chemistry · Structure of Atom

Which of the following statements is correct about photoelectric effect?
1. The number of electrons ejected from metal surface is inversely proportional to intensity of light.
2. Below threshold frequency, photoelectric effect can be observed.
3. At higher frequency than threshold frequency, the ejected electrons have certain kinetic energy.
4. At higher frequency than threshold frequency, the electron is still on the metal surface.

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Answer & Solution

Correct Answer

(C) 3

Step-by-step Solution

Detailed explanation

Kinetic energy of photoelectrons \(\mathrm{KE}=h v-h v_0\) \(\Rightarrow\) When \(v > v_0, \mathrm{KE} > 0\) So, statement 3 is correct. where, \(v=\) frequency of incident light \(v_0=\text { threshold frequency }\) Now, other options will be correct when 1. Number of…

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.

Same subject

List-I (Molecule)	\(\text{List-II (Dipole moment in D)}\)
A) \(\mathrm{HCl}\)	I) \(1.07\)
B) \(\mathrm{NH}_3\)	II) \(1.85\)
C) \(\mathrm{H}_2\mathrm{O}\)	III) \(0.23\)
D) \(\mathrm{NF}_3\)	IV) \(1.47\)

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