Question

The kinetic energy of the photoelectrons ejected from the metal surface $A$ is $K$ when required radiation is incident. If the same radiation is capable of ejecting the electrons from the metal $B$ with higher work function, then the kinetic energy of the photoelectrons -

• A. $=K$
• B. $>K$
• C. $<K$
• D. $\ge K$

Answer 1

The correct option is C $<K$

The Einstein photoelectric effect equation is -

$K{E}_{\text{max}}=h\nu -\varphi$

We can see that for the same radiation, if work function is increased the kinetic energy of the photoelectrons are decreased.

Therefore, kinetic energy of photoelectrons from the metal $B$ will be lesser than those from metal $A$.

Hence, option $\left(C\right)$ is the correct answer.