The figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?

  • A
    Curves $(b)$ and $(c)$ represent incident radiations of same frequencies having same intensity.
  • B
    Curves $(a)$ and $(b)$ represent incident radiations of same frequencies but of different intensities.
  • C
    Curves $(a)$ and $(b)$ represent incident radiations of different frequencies and different intensities.
  • D
    Curves $(b)$ and $(c)$ represent incident radiations of different frequencies and different intensities.

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