The stopping potential `V` for photoelectric 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 straight line
B. Product of the intercept along the X-axis and the mass of the electron
C. Product of the slope of the line and the charge on the electron
D. Intercept on the Y-axis divided by the charge on the electron

Answer

C

Explanation

According to Einstein's photoelectric equation,
Maximum K.E. (K) `=eV=hv-W_(0)`
`:.V=(hv)/(e)-(W_(0))/(e)`
Comparing with `y=mx+c`, we find that the graph is a straight line.
`:.` Slope of the graph `=h/e`.
`:.` Planck's constant (h) `=e xx` slope of the straight line