Question

For the photoelectric effect, the maximum kinetic energy $\left(\right.E_{K})$ for the emitted photo electrons is plotted against the frequency $\nu$ of the incident photons as shown in figure. The slope of the curve give

• A. charge of the electron
• B. work function of the metal
• C. Planck's constant
• D. ratio of the Planck's constant to electronic charge

Answer 1

Answer: (C)

$\text{E}_{\text{K}} \, \text{=} \, \text{h} \nu - \text{E}_{\text{0}}$
where $E_{0}=$ work function
$y=mx+c$
Comparison shows that the Plank's constant will be the slope of the line.