First slide

Photo Electric Effect

Question

Light of wavelength 5000 A falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy of the photoelectron emitted will be

Very Easy

A

0.58 eV
B

2.48 eV
C

1.24 eV
D

1.16 eV

Solution

$\begin{array}{l} E = W_{0} + K_{\max}; E = \frac{12375}{5000} = 2 .475 eV \\ ∴ K_{\max} = E - W_{o} = 2 .475 - 1 .9 = 0 .57 eV \end{array}$

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