- Define the term intensity of radiation' in photon picture.
- Plot a graph showing the variation of photo current vs collector potential for three different intensities $I_1 > I_2 > I_3$, two of which $(I_1$ and $I_2)$ have the same frequency v and the third has frequency $v_1 > v.$
- Explain the nature of the curves on the basis of Einstein's equation.
CBSE OUTSIDE DELHI - SET 3 SOUTH 2016
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- Intensity of radiation equals the energy of all the Photons incident normally per unit area per unit time.
The intensity of radiation is proportional to the number of photons emitted per unit area per unit time.
- As per Einstein’s equation:
- The stopping potential is same for $I_1$ and $I_2$ as they have the same frequency.
- The saturation currents are as shown, because $I_1 > I_2 > I_3.$
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