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WBJEE 2020 Physics Solved Paper
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© examsnet.com
Question : 36
Total: 40
A point source of light is used in an experiment of photo-electric effects. If the distance between the source and the photo-electric surface is doubled, which of the following may result ?
Stopping potential will be halved
photo-electric current will decrease
Maximum kinetic energy if photo-electrons will decrease
Stopping potential will increase slightly
Validate
Solution:
Intensity
I
∝
1
d
2
and photo-electric current ∝ intensity
∴ Current will decrease
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