Which of the following is used for heat detection?

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Infrared rays are commonly used for heat detection due to their ability to detect thermal radiation emitted by objects. All objects emit infrared radiation based on their temperature, and this radiation can be detected by sensors. This principle is utilized in various applications, including thermal imaging cameras, which can visualize heat patterns and identify hot spots or temperature differences in an environment.

For instance, in medical settings, infrared imaging can help assess blood flow and identify inflammation. In industrial applications, it can be used for monitoring equipment temperatures to prevent overheating. Infrared technology is widely used in remote sensing and in everyday devices like remote controls that operate through infrared signals.

The other types of electromagnetic waves mentioned have different applications. Microwave radiation is primarily associated with communication and cooking, X-rays are used mainly for medical imaging, and ultraviolet waves are typically used for sterilization and fluorescence but do not have significant applications in directly detecting heat.