A blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence.
Imagine a sponge soaking up water from any direction. No matter where you pour water onto it, it will absorb it all. That's what a blackbody does but with light instead of water!
Blackbody Radiation: This is the type of electromagnetic radiation emitted by a blackbody when it is heated.
Spectral Radiance: It describes how much radiant flux is emitted, reflected, transmitted or received by a surface per unit area per unit solid angle per unit wavelength range.
Planck's Law: It describes how much energy (in terms of photons) objects emit at different wavelengths if they are perfect blackbodies.
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