which two conditions must exist in order for radiation to occur?\no the presence of a solid, liquid, or gas…

which two conditions must exist in order for radiation to occur?\no the presence of a solid, liquid, or gas and a temperature difference\no direct contact of molecules and the presence of a solid, liquid, or gas\no the presence of electromagnetic waves and direct contact of molecules\no a temperature difference and the presence of electromagnetic waves

which two conditions must exist in order for radiation to occur?\no the presence of a solid, liquid, or gas and a temperature difference\no direct contact of molecules and the presence of a solid, liquid, or gas\no the presence of electromagnetic waves and direct contact of molecules\no a temperature difference and the presence of electromagnetic waves

Answer

Answer:

D. a temperature difference and the presence of electromagnetic waves

Brief Explanation:

Radiation is heat - transfer by electromagnetic waves. It requires a temperature difference to drive the heat flow and electromagnetic waves for the transfer itself. No direct contact of molecules is needed as in conduction, and it doesn't depend on the state of matter in the way described in other options.