Which region is associated with wavelengths longer than 700 nm?

Which region is associated with wavelengths longer than 700 nm?

• A. Infrared
• B. UV
• C. Visible light
• D. Microwave

Answer: (A)

Wavelengths longer than 700 nm belong to the infrared region. The visible spectrum ends around 700 nm, so anything beyond that is not visible to the eye but falls in infrared, which ranges roughly from about 700 nm to 1 millimeter and is closely tied to heat. Ultraviolet has shorter wavelengths, and visible light itself is up to 700 nm, while microwaves are even longer than infrared. So infrared is the best match for wavelengths longer than 700 nm.

Wavelengths longer than 700 nm belong to the infrared region. The visible spectrum ends around 700 nm, so anything beyond that is not visible to the eye but falls in infrared, which ranges roughly from about 700 nm to 1 millimeter and is closely tied to heat. Ultraviolet has shorter wavelengths, and visible light itself is up to 700 nm, while microwaves are even longer than infrared. So infrared is the best match for wavelengths longer than 700 nm.