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

The question was asked in an interview for internship.

Question is taken from Black Body Radiation topic in division Quantum Physics of Engineering Physics I

Answer 1

Right answer is (c) First increases then decrease

Easiest explanation: In the case of Black Body radiations, as the body gets hotter the wavelength of the emitted radiation decreases. However, the intensity first increases up to a specific wavelength than starts decreasing, as the wavelength continues to decrease.