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Inter-Conversion of Temperature in Different Scales

In pyrometer ...

Question

In pyrometer , temperature measured is proportional to $- ------- -$ energy emitted by the body

A

light

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B

electric

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C

radiation

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D

All the above

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Solution

The correct option is A radiation
Stefan- Boltzann law, $j^{⋆} = ε σ T^{4}$ connects temperature T with thermal radiation or irradiance $j^{⋆}$ .
Thus measuring the irradiance with pyrometer yields the temperature of the body.

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Inter-Conversion of Temperature in Different Scales

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