A point source of light is placed at a distance d from the photo cell.if the distance becomes d/3 then number of electrons per second
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Therefore, Number of electrons emitted is a quarter of the initial number.
Explanation:
Intensity, I = E /At
- E = the total energy of source,
- A = area of illuminated surface,
- t = time
I = E / 4πr^2 t
I1 / I2 = E / 4πr1^2 t x 4πr2^2 t / E
I1 / I2 = r2^2 / r1^2
I1 / I2 = 4 / 1
I2 / I1 = 1 / 4
Since, ∝ number of photo-electrons emitted
Therefore, Number of electrons emitted is a quarter of the initial number.
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