The figure shows a plot of photo current...

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

Curves a and b represent incident radiations of different frequencies and different intensities

curves a and b represent incident radiations of same frequency but of different intensities.

curves b and c represent incident radiations of different frequencies and different intensities.

Curves b and c represent incident radiations of same frequency having same intensity

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