The velocity of heat radiation in vacuum is

Equal to that of light
Less than that of light
Greater than that of light
Equal to that of sound
Equal to that of light  Electrons are generally responsible for heat conduction. The phonons (vibrations of the nuclei) also play a part, depending on the temperature of the medium. It depends on the specific conductor youโ€™re using. At some point, in a vacuum, the electrons have to be excited enough to spit out photons, which are Electromagnetic radiation, which in a vacuum should go on forever at the speed of light theoretically.

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