Write Planck's equation .

Explanation

The postulates of Planck.s quantum theory are
a) The emission of radiation is due to vibrations of charged particles (electrons) in the body.
b) The emission is not continuous but in discrete packets of energy called "quanta". This emitted radiation propagates in the form of waves,
c) The energy (E) associated with each quantum for a particular radiation of frequency.v. is given by E = hu. Here .h. is Planck.s.constant.
d) A body can emit or absorb either one quantum (hu) of energy or some whole number multiple of it. Thus.energy can be emitted or absorbed as hu, 2hv, 3hv etc., but not fractional values. This is called quantisation of energy.
The emitted radiant energy is propagated in the form of waves.
f) Values of Planck.s constant in various-units :
`h=6.625xx10^(-27)` erg.sec(or) `gcm^(2)s^(-1)`
`=6.625xx10^(-34)` j.s (or) `kgm^(2)s^(-1)=1.58xx10^(-34)` cal.s.
Success of Planck.s quantum theory: This theory successfully explains the black body radiations.
A black body is a perfect absorber and also a perfect radiator of radiátions.