ધાતુનું કાર્ય વિધેય 3 eV છે. ફોટોઈલેક્ટ્રોનનું ઉત્સર્જન કરવા માટે જરૂરી દ્રશ્ય પ્રકાશનો રંગ કયો છે?

A લીલો
B વાદળી
C લાલ
D પીળો

Verified Solution

Answer & Solution

Correct Answer

(B) વાદળી

Step-by-step Solution

Detailed explanation

\(\begin{aligned} & (\mathrm{KE})_{\max }=\frac{\mathrm{hc}}{\lambda}-\phi \\ & \frac{\mathrm{hc}}{\lambda} \gt \phi[\text { for emission }] \\ & \lambda \lt \frac{\mathrm{hc}}{\phi} \Rightarrow \lambda \lt \frac{1242}{3} \mathrm{~nm} \end{aligned}\) આથી વાદળી પ્રકાશ વિકલ્પ (B)

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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