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Australia Telescope National Facility

Temperature as a measure of power

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One can treat the power received from an astronomical source as being roughly equivalent to that of a black body.

Formally, a black body is represented by the Planck law, where k is the Boltzmann constant and h is the Planck constant.


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However, for low frequencies (and temperatures that are not too low, thus for , the "Rayleigh-Jeans law"), this can be approximated as


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This implies that the power received is directly proportional to a temperature. Now, WHICH power are we talking about?

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