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Radiation from a black body at the thermodynamic temperature T1 is measured by a small detector at distance d1 from it. When the temperature is increased to T2 and the distance to d2 , the power received by the detector is unchanged. What is the ratio d2/d1 ?

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Radiation from a black body at the thermodynamic temperature T<sub>1</sub> is measured by a small detector at distance d<sub>1</sub> from it. When the temperature is increased to T<sub>2</sub> and the distance to d<sub>2</sub> , the power received by the detector is unchanged. What is the ratio d<sub>2</sub>/d<sub>1</sub> ?






 
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