Question

The stopping potential V for photoelectric emission from a metal surface is plotted along Y-axis and frequency of incident light along X-axis. A straight line is obtained as shown. Planck’s constant is given by

• A. slope of the line
• B. product of slope of the line and charge on the electron
• C. intercept along Y-axis divided by charge on the electron
• D. product of intercept along X-axis and mass of the electron

Answer 1

The correct option is B product of slope of the line and charge on the electron

From Einstein’s equation of the photoelectric effect
$hv=h{v}_0+e{V}_0$

$Slope=\frac{h}{e}$