Question: Q. 2. Write three basic properties of photons which are used to obtain Einstein’s photoelectric equation. Use this equation to draw a plot of maximum kinetic energy of the electrons emitted versus the frequency of incident radiation.
R [Delhi OD Comptt. I, II, III 2014, 2013;
OD I, II, III 2013]
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Solution:
Ans. Three basic properties of photons :
(i) Photons are quanta or discrete carriers of energy.
(ii) The energy of a photon is proportional to the frequency of light.
(iii) The photon gives all its energy to the electron with which it interacts. Einstein’s photelectric equation :
The plotis as shown below. $\frac{1}{2} \mathrm{~m} v_{\max }^{2}$
[CBSE Marking Scheme 2013, 14]
