State: (a) The S.I. unit of the intensity of a blackbody radiation. (b) Two features of the intensity-wavelength graph of a perfect blackbody at different t...
(a) The S.I. unit of the intensity of a blackbody radiation.
(b) Two features of the intensity-wavelength graph of a perfect blackbody at different temperatures.
(a) The S.I. unit of intensity of blackbody radiation is watt per square metre, \(\mathrm{W\,m^{-2}}\).
(b) Intensity-wavelength curves for a perfect blackbody at two different temperatures are shown below.
The hotter blackbody, T₂, has a higher maximum intensity and a shorter peak wavelength than the cooler blackbody, T₁.
As the temperature increases, the maximum intensity increases. Thus, the curve for \(T_2\) has a higher peak than that for \(T_1\).
As the temperature increases, the wavelength at which maximum intensity occurs decreases. Thus, \(\lambda_{\max}\) shifts towards shorter wavelengths, in accordance with \(\lambda_{\max}T=\text{constant}\).
(a) The S.I. unit of intensity of blackbody radiation is watt per square metre, \(\mathrm{W\,m^{-2}}\).
(b) Intensity-wavelength curves for a perfect blackbody at two different temperatures are shown below.
The hotter blackbody, T₂, has a higher maximum intensity and a shorter peak wavelength than the cooler blackbody, T₁.
As the temperature increases, the maximum intensity increases. Thus, the curve for \(T_2\) has a higher peak than that for \(T_1\).
As the temperature increases, the wavelength at which maximum intensity occurs decreases. Thus, \(\lambda_{\max}\) shifts towards shorter wavelengths, in accordance with \(\lambda_{\max}T=\text{constant}\).