State: (a) The S.I. unit of the… | Physics

Question 1 Report

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 temperatures.

Answer

Answer Details

(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.

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 \(\lambda_{\max}T=\text{constant}\).

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...