- Define the term ‘intensity of radiation’ in terms of photon picture of light.
- Two monochromatic beams, one red and the other blue, have the same intensity. In which case (i) The number of photons per unit area per second is larger, (ii) The maximum kinetic energy of the photoelectrons is more? Justify your answer.
CBSE OUTSIDE DELHI - SET 2 PATNA 2015
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- Intensity of radiation is determined by the number of photons incident per unit area per unit time.
- Red Light.
Alternate Answer
$\text{hv}_{red} < \text{hv}_{blue}$
- Blue Light.
Alternate Answer
$\text{hv}_{red} > \text{hv}_{blue}$
Note: [The Einstein's photoelectric equation:
$\text{hv} = \text{hv}_{\circ} + \frac{1}{2}\text{mv}^{2}_{max}$
Instead of the reason in part.]
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