Question

As the wavelength of the radiation decreases, the intensity of the black body radiations ____________

• A. Increases
• B. Decreases
• C. First increases then decrease
• D. First decreases then increase

Answer 1

Answer: (C)

The explanation for the correct option:

Option(C) First increases then decrease

• In the case of Black Body radiations, as the body gets hotter the wavelength of the emitted radiation decreases
• At a given temperature, the intensity of black body radiations first increases up to a specific wavelength, then starts decreasing, as the wavelength continues to decrease.

• A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The name "black body" is given because it absorbs all colors of light. A black body also emits black-body radiation

• The intensity of blackbody radiation depends on the wavelength of the emitted radiation and on the temperature T of the blackbody.

Hence, Option(C) First increases then decrease, As the wavelength of the radiation decreases, the intensity of the black body radiation.