Infrared radiation (IR) is a type of electromagnetic radiation that has wavelengths longer than visible light but shorter than microwaves. The wavelength of infrared radiation ranges from about 700 nanometers (nm) to 1 millimeter (mm). This corresponds to a frequency range of approximately 430 terahertz (THz) down to 300 gigahertz (GHz).
The frequency of infrared radiation is typically measured in terahertz (THz). One THz is equal to 10^12 hertz. The frequency of infrared radiation can vary depending on the source of the radiation. For example, the frequency of infrared radiation emitted by a human body is about 10 THz, while the frequency of infrared radiation emitted by a fire is about 100 THz.
Infrared radiation is used in a variety of applications, including:
- Remote controls: Infrared radiation is used to transmit signals from remote controls to devices such as televisions and stereos.
- Medical imaging: Infrared radiation is used to create images of the body in medical imaging procedures such as thermal imaging and infrared spectroscopy.
- Night vision: Infrared radiation can be used to see in the dark, making it useful for night vision devices such as goggles and cameras.
- Industrial applications: Infrared radiation is used in industrial applications such as food processing and quality control.
Infrared radiation is a versatile form of radiation with a wide range of applications. Its low frequency and long wavelength make it ideal for applications where penetration is required, such as medical imaging and night vision. However, its low frequency also means that it carries less energy than other forms of radiation, such as visible light and ultraviolet radiation. This makes it less harmful to living things.
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