Represent graphically the variation of photoelectric current with the intensity of incident radiation for a given photo sensitive material.

Represent graphically the variation of resistivity with absolute temperature for copper and nichrome metals .

Represent the variation of kinetic energy of photoelectrons with respect to frequency graphically.

Define the terms (i) 'cut-off voltage' and (ii) threshold frequency' in relation to the phenomenon of photoelectric effect. Using Einstein's photoelectric equation show how the cut-off voltage and threshold frequency for a given photosensitive material can be determined with the help of a suitable "plot" // "graph" .

The following graph represents the variation of photo current with anode potential for a metal surface . Here l_(1),l_(2) and l_(3) represents intensities and gamma_(1), gamma_(2) , gamma_(3) respectively , them .

Draw a plot showing the variation of potoelectric current with collector plate potential for two different frequencies, v_(1) gt v_(2) , of incident radiation having the same intensity. In which case will the stopping potential be hgiher ? Justify your answer.

A graph of stopping potential of a photo sensitive metal with the frequency of incident radiation is plotted. What does the slope of this curve represent?