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Dual Nature of Radiation and Matter
Effect of Intensity on Photoelectric Current
1 question from 1 paper, each with its answer.
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- 1
- paper
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- of Dual Nature of Radiation and Matter
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Concepts tested
- Inverse square law and photocurrent
All Questions
2001 AIPMT 1 question
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A photo-cell is illuminated by a source of light, which is placed at a distance d from the cell. If the distance becomes d/2, then number of electrons emitted per second will be : -For a point source, intensity $I \propto \dfrac{1}{d^2}$.
When the distance is halved, the intensity becomes $\dfrac{1}{(1/2)^2} = 4$ times.
The number of photoelectrons emitted per second is proportional to the intensity (number of photons per second).
So the number of electrons emitted per second becomes four times.