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| Q. |
The velocity of heat radiation in vacuum is – |
| A. | Equal to that of light |
| B. | Less than that of light |
| C. | Greater than that of light |
| D. | Equal to that of sound |
| Answer» A. Equal to that of light | |
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Explanation: 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 you'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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