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(a)Draw a plot showing the variation of photoelectric current with collector potential for different frequencies but same intensity of incident radiation.

(b) Use Einstein's photoelectric equation to explain the observations from this graph.

(c) What change will you observe if intensity of incident radiation is changed but the frequency remains the same?                                                                             3marks  

Explanation:

(a)

(b) According to Einstein's photoelectric equation 

                             Kmax=hv - 0                                                              12 mark

If V0 is stopping potential then

                           eV0=hv - ϕ

Thus for different value of frequency (v) there will be a different value of cut off potential V0.        

                                                                                                                        12mark

(c)

                                         1mark             

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