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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...happiness does not consist in amusement. In fact, it would be strange if our end were amusement, and if we were to labor and suffer hardships all our life long merely to amuse ourselves.... The happy life is regarded as a life in conformity with virtue. It is a life which involves effort and is not spent in amusement....
-Aristotle