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

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter1 Mark
MCQ
For question two statements are given$-$one labelled Assertion $(A)$ and the other labelled Reason $(R)$. Select the correct answer to these questions front the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion $(A):$ Stopping potential depends upon the frequency of incident light but is independent of the intensity of the light.
Reason $(R):$ The maximum kinetic energy of the photoelectrons is proportional to stopping potential.
  • A
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A.$
  • ✓
    Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
  • C
    $A$ is true but $R$ is false.
  • D
    $A$ is false and $R$ is also false.
✓

Answer

Correct option: B.
Both $A$ and $R$ are true but $R$ is not the correct explanation of $A.$
Stopping potential is a measure of maximum kinetic energy of emitted photoelectron $\left(\mathrm{eV}=\mathrm{K}_{\max }\right)$ and $\mathrm{K}_{\max }$ depends upon the frequency of incident light but is independent of intensity.

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