Infrared radiation is detected by (a) spectrometer (b) pyrometer (c) nanometer (d) photometer

Answer: (b). A pyrometer measures temperature from the thermal (infra-red) radiation a body emits. Spectrometer analyses spectra, photometer measures visible light; nanometer is a unit, not an instrument. So the answer is (b) pyrometer.

Infrared radiation is detected by | JEE Main 2002 (AIEEE)

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Thermal Radiation: Black Body, Stefan & Wien

Infrared radiation is detected by

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Answer: (b)

A pyrometer measures temperature from the thermal (infra-red) radiation a body emits.
Spectrometer analyses spectra, photometer measures visible light; nanometer is a unit, not an instrument.
So the answer is (b) pyrometer.

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