Radiation Spectrum

Black body spectrum

Try this experiment given below and learn how spectrum of heat radiation behaves

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The study of black body radiation in terms of wavelength  was carried out by Lummer and pringsheim maintaining the black body at different temperature. The system was studied by both of them at different temperature. The result was manupulated on  a graph of intensity of radiation versus different wavelength corresponding to that radiation intensity.

From the experimental curves, it was concluded that 

(1) Intensity of radiation  emitted increases with increase in wavelength.

(2) For a particular wavelength (λ_max) , the intensity of radiation emitted  is maximum and then decreases  with further increase in wavelength.

(3) Area under  the curve ( Eλ) versus (λ)  represent total energy emitted per second  per unit area by a perfectly black body.

Different Spectrum at different temperature are shown above in diagram.

We conclude that,

1) Energy distribution curves continues to be non-uniform.

2) Peak of ( Eλ) versus (λ) curve shift towards left, It means as temperature increases value of (λ_max) decreases.

<<< Ferry's black body>>> l <<<Wien's Displacement Law>>>

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