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Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter2 Marks
Question
Write Einstein’s photoelectric equation. State clearly the three salient features observed in photoelectric effect, which can be explained on the basis of the above equation.
✓

Answer

Einstein’s photoelectric equation:
$\text{K}_{max} = \text{hv} - \phi_{0} = \text{h}(\text{v} - \text{v}_{0})$
  1. Kmax of electrons depends linearly on v.
  2. Kmax is independent of intensity of radiation.
  3. There exists a threshold frequency $\text{v}_{0}\it{( = \phi_{0}/\text{h})}$ for the metal surface, below which no photoelectric emission is possible. (No matter how intense the incident radiation may be or how long it falls on the surface.)
  4. For v > v0, photoelectric current is proportional to intensity of incident radiations.

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