Question

Work function of a metal plate is defined as

Answer 1

Answer:

The work function of a metal is the minimum energy required by an electron to just escape from themetal surface so as to overcome the restraining forces at the surface.

Answer 2

Answer:

Energy of striking photon = binding energy + kinetic energy of photon

This means that a certain minimum amount of energy corresponding to the binding energy VF rom the metal pl ate

thus when a photon of Energy hv strikes

a metal surface some of its energy called threshold energy X is used up to remove from the surface of metal

Therefore.

hv = × + 1/2 mv^2

then X threshold energy =hv°

hv = hv° +1/2mb^2mb

or

1/2= hv - hv°

therefore the K. E.

1/2mv^2 = h ( v_v°)

the threshold energy X also call work function w°

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