Define black body radiations.
Answers
A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. A white body is one with a "rough surface that reflects all incident rays completely and uniformly in all directions."
Answer:
Black body radiations are radiations which are emitted by black bodies
black bodies are defines as perfect absorber and radiator
Explanation: This black body radiations is one of the concept which explained the particle nature of light
Max Planck explained the particle nature of light by telling that 'Emission of radiation is not continuous whereas it is discontinuous in form of energy packets called 'QUANTA'. EACH PACKET IS CALLED 'QUANTUM'.
He also gave a equation for this
E=nhv(nue)
where
E is enegy emitted from radiations
n is no. of quantum which is a whole number and not fractional
h is planck's constant= 6.6*10^-34
v(nue) is frequency
NOTE: please note that the above equation is applicable for only black body radiations and not for all electromagnetic radiations