To a physicist, a blackbody is defined as an object that
A) always emits the same spectrum of light, whatever its temperature.
B) reflects all radiation that falls on it, never heating up and always appearing black.
C) always appears to be black, whatever its temperature.
D) absorbs all radiation that falls on it.

Question

Quizplus · Accepted Answer

A blackbody in physics is an idealized object that absorbs all electromagnetic radiation that falls onto it, regardless of frequency or angle of incidence. This means it does not reflect or transmit any light, making it a perfect absorber. However, a blackbody also emits radiation in a spectrum that depends on its temperature, according to Planck's law, which is not mentioned in the choices but is an important characteristic of blackbodies.

To a Physicist, a Blackbody Is Defined as an Object