Physics, 27.01.2020 21:31 unknownroses

Which two conditions must exist in order for radiation to occur?
the presence of a solid, liquid, or gas and a temperature difference
direct contact of molecules and the presence of a solid, liquid, or gas
the presence of electromagnetic waves and direct contact of molecules
a temperature difference and the presence of electromagnetic waves

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Which two conditions must exist in order for radiation to occur?
the presence of a solid, liq...