Photoelectric effect can be caused by

Options :
  1. visible light but not by X-rays
  2. Gamma rays but not by X-rays
  3. Ultraviolet light only
  4. visible light, ultraviolet, X-rays and gamma rays
Answer and Explanation :-

Answer: Option 4

Explanation:

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He brooded on how close destruction always was to all creatures, animals as well as humans, and he realized that there is nothing we can predict or know for certain in this world except death.
-Hermann Hesse The Fairy Tales of Hermann Hesse