Question

The energy of the most energetic photo electrons emitted from a metal target, depends upon

• A. threshold frequency of the metal.
• B. photo electric work function.
• C. wavelength of the incident radiation.
• D. All of the above

Answer 1

The correct option is D All of the above

$(K.E{)}_{max}=$ The energy of the most energetic photo electrons emitted from the surface.
$(KE{)}_{max}=E-{\varphi }_0$
Where; $E=$ Energy of incident radiation $=\frac{hc}{\lambda }=hf$ where, $\lambda$ is wavelength of incident radiation.
$\therefore$ Option $\left(C\right)$ is true.

Also, ${\varphi }_0$ is work function
$\therefore$ Option $\left(B\right)$ is valid.

Now, ${\varphi }_0=h{f}_o$
Where, $f_0$ is threshold frequency of the metal.
$\therefore$ option $\left(A\right)$ is valid too.
Hence, Option $\left(D\right)$ is the correct answer.

$\begin{array}{c}\text{Why this question?}\\ \text{This question tests the knowledge regarding the dependnce of most energetic particles emitted from metal target with respect to different options given.}\end{array}$