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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): Mass of moving photon varies inversely to the wavelength.
Reason (R): Energy of the particle = Mass × (Speed of light)2
✓

Answer

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

Explanation:

Mass of moving photon

$\text{m}=\frac{\text{h}\upsilon}{\text{c}^2}=\frac{\text{h}}{\text{c}\lambda}$ and $\text{E}=\text{mc}^2$.

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