Question: Q. 10. -rays fall on a photosensitive surface to cause photoelectric emission. Assuming that the work function of the surface can be neglected, find the relation between the de-Broglie wavelength of the electrons emitted to the energy of the incident photons. Draw the nature of the graph for as a function of . [Delhi Comptt. I, II, III 2014]
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Solution:
Ans. } & E_{V} & =\phi_{0}+K_{\max } \
\text { As } & & \phi_{0} & =0 \
\Rightarrow & E_{\mathbf{V}} & =K_{\max } \
\Rightarrow & K_{\max } & =\frac{p^{2}}{2 m}=E_{\mathbf{V}} \
\Rightarrow & & p & =\sqrt{2 m E_{\mathrm{V}}}
\end{array}
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Wavelength of emitted electrons,

[CBSE Marking Scheme, 2014]