Question

The surface of Lithium of work function ᶲ is illuminated by electromagnetic radiation whose electric field component varies with time as E=a(1+Cosωt)Coskt . The maximum kinetic energy of photo electron liberated from surface is______________

Answer 1

Answer on Question #63935-Physics-Atomic and Nuclear Physics

The surface of Lithium of work function $\Phi$ is illuminated by electromagnetic radiation whose electric field component varies with time as $E = a(1 + \cos \omega t)\cos kt$ . The maximum kinetic energy of photo electron liberated from surface is

Answer

The frequency of electromagnetic radiation is

$$f = \frac {\omega}{2 \pi}.$$

The maximum kinetic energy of photo electron liberated from surface is

$$K = h \frac {\omega}{2 \pi} - \phi = \hbar \omega - \phi .$$

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