Photo Electric Effect
=> given
by H. Hertz(1887)
=> When
a beam of light strike a metal surface then electrons were ejected. This phenomena
is known as photo electric effect.
1. Electrons
ejected from metal surface when beam of
light strike the metal surface
2. Number
of electron ejected is directly proportional to intensity (or brightness) of
light
3. There
is characteristic minimum frequency (n0
threshold frequency) below which photoelectric effect is not observed.
4. If
n
> n0
then electrons comes out with kinetic energy which increases with increase in frequency
of light.
Kinetic
energy of ejected electrons is given by-
h
n
= h n0+
½(meV2)