First slide

Photo Electric Effect

Question

What is the stopping potential for photo electrons ejected from a metal of work-function 1.2 eV when the incident light consists of photons of energy 1.8 eV ?

Easy

A

0.6V
B

1.2 V
C

1.8 V
D

2.4 V

Solution

${(K.E.)}_{max} = (1 \cdot 8 - 1 \cdot 2) = 0 \cdot 6 eV$

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