The correct answer is option 2: Pyrometer
- Option 1 : Spectrometer- This is incorrect because a spectrometer is mainly used to study and measure the spectrum of light or other electromagnetic radiations, not specifically to detect infra-red heat radiations.
- Option 2 : Pyrometer- This is correct because a pyrometer detects infra-red radiations emitted by hot objects and is used for measuring temperature without direct contact.
- Option 3 : Nanometer. This is incorrect because a nanometer is a unit of length used to measure very small distances, especially wavelengths.
- Option 4 : Photometer. This is incorrect because a photometer measures the intensity or brightness of visible light, not specifically infra-red radiations.
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