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Q.
Using which of the following instruments, the temperature of the sun can be determined?
Thermal Properties of Matter
Solution:
Pyrometers are the devices used to measure the temperature by measuring the intensity of radiations received from the body. They are based on the fact that the amount of radiation emitted from a body per unit area per second is directly proportional to the fourth power of temperature (Stefan's law). These can be used to measure temperature ranging from 800$^{\circ}$C to 6000$^{\circ}$C