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Q)

The study of photoelectric effect is useful in understanding :

$\begin{array}{1 1}(a)\;\text{Conservation of energy}\\(b)\;\text{Quantization of charge}\\(c)\;\text{Conservation of charge}\\(d)\;\text{Conservation of kinetic energy}\end{array}$

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A)
Toolbox:
  • Study of the photoelectric effect led to important steps in understanding the quantum nature of light and electrons and influenced the formation of the concept of wave–particle duality.
  • The photons of a light beam have a characteristic energy proportional to the frequency of the light.
  • All of the energy from one photon must be absorbed and used to liberate one electron from atomic binding, or else the energy is re-emitted. If the photon energy is absorbed, some of the energy liberates the electron from the atom, and the rest contributes to the electron's kinetic energy as a free particle.
The radiation energy absorbed is used to overpower effective nuclear charge and importing velocity to electron.
Hence (a) is the correct answer.
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