Question

The work functions of three metals $A, \, B$ and $C$ are $W_{A}, \, W_{B}$ and $W_{C}$ respectively. They are in decreasing order. The correct graph between kinetic energy and frequency $\nu$ of incident radiation is

• A.
• B.
• C.
• D.

Answer 1

Answer: (B)

Irrespective of the photosensitive material used, the slope of each line should be same, since slope Since, $W _{ A }> W _{ B }> W _{ C } \Rightarrow \left(v_{0}\right)_{ A }>\left(v_{0}\right)_{ B }>\left(v_{0}\right)_{ C }$
$\therefore \quad$ a is not possible.
Options (iii) and (iv) are not possible, since the graphs are not parallel.