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  • A photon of wavelength 4 x 10 ^ - 7 m strikes on metal surface, the work function of the metal being 2.13 eV. Calculate (i) the energy of the photon (eV).

2.9    A photon of wavelength 4\times 10^{-7}m strikes on metal surface, the work function of the metal being 2.13 eV. Calculate (i) the energy of the photon (eV)

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The photon is having a wavelength of 4\times 10^{-7}m strikes on a metal surface, where the work function of the metal being is 2.13\ eV.

So, Energy of the photon:

E = h \nu = \frac{hc}{\lambda}= \frac{(6.626\times10^{-34}J.s)\times (3.0\times10^8 ms^{-1})}{(4\times10^{-7} m)}

                              =4.97\times10^{-19}J 

                              =\frac{4.97\times10^{-19}J}{1.602\times10^{-19}}eV

                               = 3.10\ eV

Posted by

Divya Prakash Singh

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