CUET · PHYSICS · PYQ PAPER 2023
The work function for a metallic surface is 4.0 eV. The longest wavelength of light that can cause photoelectron emission is approximately:
- A 540 nm
- B 400 nm
- C 310 nm
- D 220 nm
Answer & Solution
Correct Answer
(C) 310 nm
Step-by-step Solution
Detailed explanation
\(\lambda_{max} = \frac{hc}{\phi}\) \(\lambda_{max} = \frac{1240 \text{ eV·nm}}{4.0 \text{ eV}}\) \(\lambda_{max} = 310 \text{ nm}\)
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