WHICH OF THE FOLLOWING THERMOMETERS MEASURES TEMPERATURE FROM THE THERMAL RADIATION EMITTED BY OBJECTS

• A. Thermocouple thermometer
• B. Platinum resistance thermometer
• C. Pyrometer thermometer ✓
• D. Constant pressure gas thermometer

The answer to the question is: C. Pyrometer thermometer

The thermometer that measures temperature from the thermal radiation emitted by objects is the pyrometer thermometer. Pyrometers are used to measure high temperatures, typically in industrial and scientific applications. They work based on the principle that all objects emit thermal radiation as a function of their temperature. The amount of radiation emitted is related to the temperature of the object, and pyrometers measure this radiation to determine the temperature.

Pyrometers can be categorized into several types based on their working principles, including optical pyrometers, infrared pyrometers, and radiation pyrometers. Optical pyrometers use the visible light emitted by hot objects to measure their temperature. Infrared pyrometers measure the infrared radiation emitted by objects, while radiation pyrometers measure the total radiation emitted across a broad spectrum.

The most common type of pyrometer used today is the infrared pyrometer, which measures temperature by detecting the infrared energy emitted by an object. These instruments are widely used in various industries, including metalworking, glass manufacturing, ceramics, and other high-temperature processes.