question_answer

According to Einsteins 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 Einsteins photo- electric equation with the equation of straight line. Einsteins photoelectric equation is \[KE=hv-\phi \]            ...(i) 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 (-(|)) on the kinetic energy axis, is obtained.