Question

What is the wavelength range,in nanometer,for infrared light? In what portion of this range does the earth receive IR from the sun? What are the wavelength limits for the thermal IR range?

Answer 1

• The wavelength range of Infrared radiation is 700 nanometers to 1 millimeter.
• The sun emits mainly near-infrared which is mainly composed of wavelength below 4 micrometers.
• The thermal range of infrared ranges between wavelengths 3.5 and 2.0 micrometers

Explanation:

The wavelength range of Infrared radiation is 700 nanometers to 1 millimeter. This also translates to a frequency range of 430 TeraHertz  to 300 Giga Hertz.

Because the sun is a star and is hot in comparison to earth and other planetary bodies, the bigger  range of infrared radiation it emits is in the near-infrared which is mainly composed of wavelength below 4 micrometers.

The earth's surface produces infrared radiation of the mid-infrared range while cooler substances will produce far-infrared range

The thermal range of infrared ranges between wavelengths 3.5 and 2.0 micrometers and is produced by black bodies.

Learn More:

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