The temperature of the sun is measured with:

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(C) pyrometer is a type of remote-sensing thermometer used to measure the temperature of surfaces. Specifically,a total radiation pyrometer is used to

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Pyrometer

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(C) pyrometer is a type of remote-sensing thermometer used to measure the temperature of surfaces. Specifically,a total radiation pyrometer is used to measure very high temperatures,such as those of the sun,because it does not require physical contact with the source. It works on the principle of Stefan-Boltzmann law,which states that the total energy radiated by a black body is proportional to the fourth power of its absolute temperature $(E \propto T^4)$. Pyrometers can typically measure temperatures ranging from $800^{\circ}C$ to $6000^{\circ}C$. Therefore,the temperature of the sun is measured with a pyrometer.

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