MHT CET202520 Apr 2025Evening ShiftPhysicsThermal Properties of MatterActual
The following graph represents the radiant power versus wavelength of the black body. The area under the curve represents
Options
- Athe maximum wavelength emitted by the object.
- Bthe minimum wavelength emitted by the object.
- Cthe total energy emitted per unit time by the black body at some particular wavelength
- Dthe total energy emitted per unit time per unit area by the black body at all wavelengths.
Correct answer
D. the total energy emitted per unit time per unit area by the black body at all wavelengths.
Step-by-step solution
The area under the spectral emissive power curve E_ versus wavelength corresponds to the total energy radiated per unit time per unit area across all wavelengths. This integral ₀^ E_ d represents the total emissive power, consistent with the Stefan-Boltzmann law E = T^4 . Option A refers to the peak wavelength _m , not the area. Option B is incorrect as minimum wavelength lacks physical significance in this context. Option C misinterprets the integral as a single-wavelength quantity rather than a cumulative measure