જ્યારે 300 nm તરંગલંબાઈનો પારજાંબલી પ્રકાશ \(2.13 \mathrm{eV}\) કાર્ય વિધેય ધરાવતી ધાતુની સપાટી પર આપાત થાય છે, ત્યારે ઇલેક્ટ્રોન ઉત્સર્જન થાય છે. નિરોધક સ્થિતિમાન _______ છે. (આપેલ છે hc =1240 eV nm )

A \(4 \mathrm{~V}\)
B \(4.1 \mathrm{~V}\)
C \(2 \mathrm{~V}\)
D \(1.5 \mathrm{~V}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(2 \mathrm{~V}\)

Step-by-step Solution

Detailed explanation

\(\frac{\mathrm{hc}}{\lambda}-\phi=\mathrm{eV}\) \(\Rightarrow \frac{1240}{300} \mathrm{eV}-2.13 \mathrm{eV}=\mathrm{eVs}\) \(\Rightarrow 4.13 \mathrm{eV}-2.13 \mathrm{eV}=\mathrm{eVs}\) \(\Rightarrow\) તેથી, \(\mathrm{V}_5=2 \mathrm{volt}\)

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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