Question

The stopping potential V₀ measured in a photoelectric experiment for a metal surface is plotted against frequency v of the incident radiation. Let m be the slope of the straight line so obtained. Then the value of charge of an electron is given by: (h is the Planck’s constant.)

Options

• mh

• `m/h`

• `h/m`

• `1/(mh)`

Answer 1

`bb(h/m)`

Explanation:

From Einstein’s equation:

hv = hv₀ + eV₀

⇒ `h/e v - h/e v_0` = eV₀

Comparing the equation with y = mx + c, where m is the slope of the straight line obtained.

∴ m = `h/e`

⇒ e = `h/m`