Eli5 What exactly causes blackbody radiation?


Ive heard that it is because of the vibration of molecules caused by heat, but if that is true, why isnt it monochromatic? are different parts of an object different temperature?

In: Physics

The particles of a heated body vibrate at a range of frequencies. This range and distribution depends on the temperature, and the number of particles of the body vibrating at a specific frequency at any time is described by the same plot as the black body radiation spectrum. Note, that a specific particle does not necessarily keep the same frequency all the time – they all interact, bumping to each other and absorbing radiation, thus exchanging energy and changing frequencies.

>are different parts of an object different temperature

Temperature is the average motion of movement in a material. Average meaning that different atoms move differently and at different speeds, but take the average of it all and you get temperature.