PHY102Thermal radiationAll bodies contain atoms/molecules in motion Indeed the speed with which they move is related to the temperature (see later)The oscillating electrons will radiate EM wavesAll bodies at non-zero temperature emit energy as thermal radiation
PHY102Thermal equilibriumConversely, all bodies absorb energy coming from EM radiation.Eg. standing in front of a fire, lying in the sun etcIndeed, all forms of life and almost all physical processes are driven by radiation from SunNotice: to stay at a fixed temperature all bodies mustboth absorb and emit thermal radiation.
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