Name: Molar Specific Heat Capacities of Gases
Uploaded: 2019-07-19
Duration: 10 min 31 s
Description: Do all gases have the same molar heat capacities? Are there certain criteria for determining molar specific heat capacities of gases? Watch the video to find...

Question

Explain energy distribution spectrum of a black body radiation in terms of wavelength.

Accepted Answer

The energy distribution spectrum of black body, shows the variation of intensity of radiation $(E_{λ})$ with wavelength $(λ)$ at different constant temperatures. Following observations can be drawn from the curve:

(i) Intensity of radiations emitted increases with increase of wavelength.

(ii) For particular wavelength $(λ_{m})$ , the intensity of radiation emitted is maximum and then decreases with further increase in wavelength.

(iii) Area under the curve, $E_{λ}$ versus $λ$ represents total energy emitted per second per unit area by the black body including all the wavelengths.

When temperature of black body is increased :-

$\Rightarrow$ The higher the temperature of a body, the higher is the area under the curve i.e. more amount of energy is emitted by the body at higher temperature.

$\Rightarrow$ The energy emitted by the body at different temperature is not uniform.

$\Rightarrow$ With an increase in the temperature of the black body, the maxima of the curve shift towards shorter wavelengths.

Explain energy distribution spectrum of a black body radiation in terms of wavelength.

Important Questions on Kinetic Theory of Gases and Radiation

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