Radiation from hydrogen discharge tube falls on a cesium plate. Find the maximum possible kinetic energy of the photoelectrons. Work function of cesium is 1.9 eV.

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Solution

Given:
Work function of cesium, $ϕ$ = 1.9 eV
Energy of photons coming from the discharge tube, E = 13.6 eV

Let maximum kinetic energy of photoelectrons emitted be K.

From the Einstein's photoelectric equation, we know that the maximum kinetic energy of photoelectrons emitted is given by
K = E − $ϕ$
= 13.6 eV − 1.9 ev
= 11.7 eV

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