AP EAMCET · PHYSICS · Dual Nature of Matter
A photon incident on a metal of work function 2 eV produced photo electron of maximum kinetic energy of 2 eV . The wavelength associated with the photon is
- A \(6200 Å\)
- B \(3100 Å\)
- C \(9300 Å\)
- D \(2000 Å\)
Answer & Solution
Correct Answer
(B) \(3100 Å\)
Step-by-step Solution
Detailed explanation
For the metal, \(\phi_0=2 \mathrm{eV}, \mathrm{k}_{\max }=2 \mathrm{eV}\) By Einstein's photoelectric equation, \(\mathrm{E}=\phi_0+\mathrm{k}_{\max }=2+2=4 \mathrm{eV}\) \(\therefore \quad\) Wavelength of the photon is \(\lambda=\frac{12400 \mathrm{eV}-Å}{4 \mathrm{eV}}=3100 Å\)
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