Question 543General Subjects - Assistant Engineer

The correct answer is D) Infrared radiation. A radiation pyrometer is a device that measures the temperature of an object by detecting the infrared radiation emitted by that object. Infrared radiation is a type of electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves. The intensity of the infrared radiation emitted by an object is directly related to its temperature, and a radiation pyrometer can use this relationship to determine the object's temperature. The other answer choices are incorrect because they do not accurately describe the type of radiation that a radiation pyrometer is sensitive to. Ultraviolet radiation and ultrared radiation are not the primary forms of radiation detected by a radiation pyrometer.