Physics
The velocity of heat radiation in vacuum is

Equal to that of light
Less than that of light
Equal to that of sound
Greater than that of light

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a higher thermal conductivity than metals
plastics have a lower density than metals
metals are good conductor of heat
metals have higher thermal capacity than plastics

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