Q. Which of the following theory argues that light is made of photons and when light shines on a metal, each photon’s energy is correlated to the electron’s speed on the metal’s surface? 
Answer: D
Notes:
Law of photoelectric effect:
- It argues that light is made of photons and when light shines on a metal, each photon’s energy is correlated to the electron’s speed on the metal’s surface.
- This theory redefined the composition of light, and it is held as a revolutionary theory, for which Einstein received the Nobel Prize in 1921.
Source: ForumIAS
