CUET · PHYSICS · PYQ PAPER 2023
The work function for Aluminium surface is 4.2 eV. Find the threshold wavelength for the photoelectric emission.
- A 2959 \( \text{\AA} \)
- B 4200 \( \text{\AA} \)
- C 4736 \( \text{\AA} \)
- D 5890 \( \text{\AA} \)
Answer & Solution
Correct Answer
(A) 2959 \( \text{\AA} \)
Step-by-step Solution
Detailed explanation
\( \lambda_0 = \frac{hc}{\phi} \) \( \lambda_0 = \frac{12400 \text{ eV}\cdot\text{\AA}}{4.2 \text{ eV}} \) \( \lambda_0 \approx 2952.38 \text{ \AA} \)
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