AP EAMCET · PHYSICS · Dual Nature of Matter
When a light of wavelength \(4900 Å\) falls on a photosensitive metal, a negative \(2 \mathrm{~V}\) potential is required to stop the emitted electrons. Then, the work-function of the material is nearly
( given charge on electron \(=1.602 \times 10^{-19} \mathrm{C}\) and Planck's constant \(=6.625 \times 10^{-34} \mathrm{Js}\) )
- A \(1.1 \mathrm{eV}\)
- B \(2.2 \mathrm{eV}\)
- C \(0.53 \mathrm{eV}\)
- D \(1 \mathrm{eV}\)
Answer & Solution
Correct Answer
(C) \(0.53 \mathrm{eV}\)
Step-by-step Solution
Detailed explanation
Given, wavelength of light, \(\lambda=4900 Å\) Stopping potential, \(V=2 \mathrm{~V}\) Energy of the incident light, \[ \begin{aligned} & E=\frac{12400 \mathrm{eV}}{\lambda Å} \\ \therefore \quad & E=\frac{12400}{4900} \mathrm{eV}=2.53 \mathrm{eV} \end{aligned} \] Kinetic…
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