Explain the influence of Planck's quantum theory on Bohr's model of structure of atom. 

Explanation

Planck's Quantum Theory :
(1) The emission of radiation is due to vibrations of charged particles (electrons )in the body.
(2) The emission of a radiation is not continuous , but in discrete packets of energy called 'quanta' . This emitted radiation propagates in the form of waves .
(3) The energy associated with each quantum (E) is given by `E=hupsilon` , where `upsilon` is the frequency of radiation and h is Planck's constant `(h=6.63xx10^(-27)"ergs")`
(4) A body can emit or absorb either one quantum `(hupsilon)` of energy or some whole number multiples of it .
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 raditor of radiations .
Explanation of Graph :
The radiations emitted by a hot black body , when passed through a prism , produce a spectrum of different wavelengths .
A plot of the 'intensity ' of radiation ' against 'wavelength ' gives a curve. Such curves obtained at different temperatures of a black body are shown in the graph .
The following conclusions can be drawn from a study of the shapes of the curves .

(i) At a given temperature , the intensity of radiation increases with wavelength, reaches a maximum and then decreases .
(ii) As the temperature increases , the peak of the curve (maximum point in curve )shifts to lower wavelengths .
The wave theory of light ' could not explain the above experimental results , satisfactorily .