First slide

Photo Electric Effect

Question

According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal versus the frequency of the incident radiation gives a straight line whose slope

Moderate

A

Is the same for all metals and independent of the intensity of the radiation
B

Depends on the intensity of the radiation
C

Depends both on the intensity of the radiation and the metal used
D

Depends on the nature of the metals used

Solution

$h\nu = h{\nu _0} + K{E_{\max }}$
⇒
$K{E_{\max }} = h\nu - h{\nu _0}$

On comparing this equation with y = mx + c we get
m = h = Universal constant

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