In 1921 Albert Einstein was awarded Nobel Prize in the study of:

  1. Black body Radiation
  2. Photoelectric effect
  3. Mass-Energy Relation
  4. Atom model

Answer (Detailed Solution Below)

Option 2 : Photoelectric effect
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The correct answer is the Photoelectric effect.

  • The photoelectric effect is the emission of electrons when electromagnetic radiation, such as light, hits a material.
  • Electrons emitted in this manner are called photoelectrons.
  • The effect states that light is made of photons.
  • It further stated that the light acts as both wave and a particle.
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