Question
  1. Write two main observations of photoelectric effect experiment which could only be explained by Einstein’s photoelectric equation.
  2. Draw a graph showing variation of photocurrent with the anode potential of a photocell.

Answer

  1.  
  1. There exists a threshold frequency below which no photoelectron is ejected.
  2. KE of electron depends linearly on frequency and is independent of intensity of radiation.
  1.  

[only curve is essential to draw]

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