AP EAMCET · PHYSICS · Dual Nature of Matter
The longest wavelength of light that can initiate photo electric effect in the metal of work function 9 eV is
- A \(1.37 \times 10^{-7} \mathrm{~m}\)
- B \(1.5 \times 10^{-7} \mathrm{~m}\)
- C \(3.7 \times 10^{-7} \mathrm{~m}\)
- D \(4 \times 10^{-7} \mathrm{~m}\)
Answer & Solution
Correct Answer
(A) \(1.37 \times 10^{-7} \mathrm{~m}\)
Step-by-step Solution
Detailed explanation
for metal, \(\phi_0=9 e^v\) \(\therefore \phi_{\mathrm{o}}=\frac{\mathrm{h}_{\mathrm{c}}}{\lambda_{\mathrm{o}}} \Rightarrow \lambda_{\mathrm{o}}=\frac{1240 \mathrm{~eV}-\mathrm{nm}}{9 \mathrm{~eV}}=1.37 \times 10^{-7} \mathrm{~m}\)
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