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

Bihar BoardEnglish MediumSTD 12 SciencePhysicsDual Nature of Radiation and Matter1 Mark
Question
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.
  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is NOT the correct explanation of A.
  3. A is true but R is false.
  4. A is false and R is also false.
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.
✓

Answer

  1. Both A and R are true but R is NOT the correct explanation of A.

Explanation:

Stopping potential is a measure of maximum kinetic energy of emitted photoelectron (eV = Kmax) and Kmax depends upon the frequency of incident light but is independent of intensity.

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