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Model Paper 2 — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryModel Paper 21 Mark
MCQ
Photoelectric effect established that light
  • ✓
    behaves like particles
  • B
    behaves like magnetic fields
  • C
    behaves like waves
  • D
    behaves like rays
✓

Answer

Correct option: A.
behaves like particles
(a) behaves like particles
Explanation: The emission of free electrons from a metal surface when light is shone on it is called the photoemission or the photoelectric effect. This effect led to the conclusion that light is made up of packets or quantum of energy. Einstein already associated the light quantum with momentum. This strongly supported the particle nature of light and these particles were named photons. Thus, the wave-particle duality of light came into the picture. Einstein won the Nobel Prize for Physics not for his work on relativity, but for explaining the photoelectric effect.

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