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  4. The graph between KE ( ( 1/2) mv max2 ) of ejected photoelectrons and the frequency v of incident radiation for a material exhibiting photoelectrid effect is shown in the figure. The work function of the matreial is

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Q. The graph between KE $ \bigg( \frac{ 1}{2} mv_{ max}^2 \bigg) $ of ejected photoelectrons and the frequency v of incident radiation for a material exhibiting photoelectrid effect is shown in the figure. The work function of the matreial isPhysics Question Image

AFMCAFMC 2005Dual Nature of Radiation and Matter

Solution:

As per Einstein's photoelectric equation
$ hv = \phi_0 + \frac{ 1}{2} mv^2 $
the intercept of KE -v graph on KE axis gives the value of work function.
Hence, work function $ f_0 = 1.5 $ eV.