Question

The graph shows the variation of stopping potential Vs with the frequency v of the incident light in photoelctric experiment.From the graph it can be concluded that (e is electronic charge
(A)The work function of the metal is eb.
(B)The work function of the metal is ea.
(C)The value of plank's constant is equal to 2eb/a
(D)The value of plank's constant is equal to ea/b

Answer 1

Explanation:

ANSWER

The Einstein's equation for photoelectric effect is given by K=hf−W

or eV

s

=hf−W where h= Planck's constant , W= work function for metal , f= frequency of incident photon.

So, V

s

=(h/e)f−W/e

It will represent a straight line with slope m=h/e.

From the given plot, m=h/e=

4×10

14

1.656

=4.14×10

−15

Vs

Answer 2

From the graph it can be concluded that;

A) The work function of the metal is eb .

Hope it's helpful to you.

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