What is heat radiation and is it like electromagnetic radiation? Heat can transfer in vacuum also but how? When anything is heated then its molecules vibrate rapidly but why anything that comes near that object also heats up? Is it something like electromagnetic radiation?
Thermal (heat) radiation is electromagnetic radiation, yes. Unless the system's temperature is at absolute zero, particles/atoms/molecules will be vibrating as you also mention and they will keep inducing electromagnetic radiation that is, by definition, induced by "time-varying total (electric) current density (displacement current density included, check Maxwell equations for the full picture -in certain cases, we consider source current density & convection current density as well)" which is what vibrating charged particles/atoms/molecules generate.
He must be one of the best professors I've seen. Both this and the string theory set of lectures are sublime
What is heat radiation and is it like electromagnetic radiation? Heat can transfer in vacuum also but how? When anything is heated then its molecules vibrate rapidly but why anything that comes near that object also heats up? Is it something like electromagnetic radiation?
Thermal (heat) radiation is electromagnetic radiation, yes. Unless the system's temperature is at absolute zero,
particles/atoms/molecules will be vibrating as you also mention and they will keep inducing electromagnetic radiation that is, by definition, induced by "time-varying total (electric) current density
(displacement current density included,
check Maxwell equations for the full picture -in certain cases, we consider source current density & convection current density as well)"
which is what vibrating charged particles/atoms/molecules generate.