MHT CET202619 April 2026Evening ShiftPhysicsThermal Properties of MatterActual
Out of the following, which statement is NOT true about black body radiation ?
Options
- AIntensity is more for shorter wavelengths ( ).
- BIntensity is same for all wavelengths ( ).
- CIntensity is less for longer wavelengths ( ).
- DA black body emits all wavelengths ( ).
Correct answer
B. Intensity is same for all wavelengths ( ).
Step-by-step solution
A black body emits radiation of all wavelengths, forming a continuous spectrum. According to Planck's law of black body radiation, the intensity of emitted radiation is not uniform across all wavelengths. The intensity increases with an increase in wavelength, reaches a maximum value at a specific wavelength (which depends on the temperature of the body), and then decreases for longer wavelengths. Therefore, the statement that the intensity is the same for all wavelengths is incorrect. Answer: Intensity is same for