<400 nm very short wavelengths correspond to which region of the spectrum?

<400 nm very short wavelengths correspond to which region of the spectrum?

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

Answer: (B)

Photons with 400 nm sit at the boundary between visible light and ultraviolet on the electromagnetic spectrum. The visible range runs roughly from about 400 nm (violet) to 700 nm (red). Wavelengths shorter than this, including around 400 nm and below, fall into the ultraviolet region. So 400 nm very short wavelengths correspond to ultraviolet. Infrared and microwave have longer wavelengths, while visible light covers the range around 400–700 nm.

Photons with 400 nm sit at the boundary between visible light and ultraviolet on the electromagnetic spectrum. The visible range runs roughly from about 400 nm (violet) to 700 nm (red). Wavelengths shorter than this, including around 400 nm and below, fall into the ultraviolet region. So 400 nm very short wavelengths correspond to ultraviolet. Infrared and microwave have longer wavelengths, while visible light covers the range around 400–700 nm.