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

Rajasthan 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.
  • ✓
    Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
  • B
    Both $A$ and $R$ are true but $R$ is $\text{NOT}$ 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: A.
Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
Stopping potential is a measure of maximum kinetic energy of emitted photoelectron $(eV = K_{max})$ and $K_{max}$ depends upon the frequency of incident light but is independent of intensity.

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