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Question 31098
JEE Physics · Hard

Kinetic Theory and Thermodynamics: KTG Advanced MCQ

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KTG AdvancedHardQuestion 31098

Question

Brownian motion was explained by Einstein (1905) as evidence for:
  1. A
    Quantum effects
  2. B
    Atomic/molecular theory of matter
    Correct
  3. C
    Electromagnetic radiation
  4. D
    Gravity at small scales

Correct answer

Atomic/molecular theory of matter

Explanation

Einstein showed that random jiggling of pollen grains in water (Brownian motion) is caused by random impacts of water molecules — direct evidence for the molecular nature of matter.

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