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

Options

A. Slope of the line
B. Product of slope on the line and charge on the electron
C. Product of intercept along Y-axis and mass of the electron
D. Product of slope and mass of electron

Answer

B

Explanation

`eV_0=hv-hv_0impliesV_0(h/e)v-(hv_0)/e`
Slope `=h/e`
Now, with equation y = mx + c
`m =h/e , :. H = me` , where m is slope.