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General
Easy
Question
In the following arrangement y = 1.0 mm, d= 0.24 mm and D = 1.2 m. The work function of the material of the emitter is 2.2 eV. The stopping potential V needed to stop the photo current will be
- 0.9 V
- 0.5 V
- 0.4 V
- 0.1 V
The correct answer is: 0.9 V
As we know in Young's double slit experiment fringe width = separation between two consecutive fringe or dark fringes 
Here 
Þ 
Þ 
Þ 
Energy of light incident on photo plate
According to Eienstein photoelectric equation
E = W0 + eV0 Þ 
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