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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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Answered by GPT-5 mini AI
a temperature difference and the presence of electromagnetic waves

Explanation: Radiation is heat transfer by electromagnetic waves (no medium or molecular contact required), and a temperature difference is needed to produce net energy flow.