question_answer

According to Einstein's photoelectric equation, the graph between the kinetic energy of photoelectrons ejected and the frequency of incident radiation is:                                                                  

A)     

B)        

C)  

D)

Correct Answer: D

Solution :

Key Idea: Compare the Einstein's photo-electric equation with the equation of straight line. Einstein's photoelectric equation is where\[\phi =\] work function of metal Comparing above Eq. (i) with equation of a straight line \[y=mx+c\] we get      \[m=h,\,\,\,c=-\phi \] Therefore, if we draw a graph between kinetic energy and frequency, then a straight line cutting the frequency axis at \[{{v}_{0}}\]and giving an intercept of \[(-\phi )\]on the kinetic energy axis, is obtained.