Question

what is the range of electromagnetic radiation that humans can see?
ultraviolet light
radio waves
visible light
infrared light
approximately, what is the wavelength of red light?
450 nm
500 nm
700 nm
380 nm

Explanation:

• For the first question:
• Ultraviolet light has a wavelength shorter than visible light and is not visible to humans.
• Radio waves have a much longer wavelength and are not visible.
• Infrared light has a wavelength longer than visible light and is not visible.
• Visible light is the range of electromagnetic radiation that humans can see.
• For the second question:
• The wavelength range of visible light is approximately \(380 - 750\) nm.
• Red light has a relatively long wavelength in the visible spectrum. Among the options, \(700\) nm is in the range of red - light wavelengths. \(450\) nm is more towards the blue - violet end, \(500\) nm is in the greenish range, and \(380\) nm is at the very start of the visible spectrum (violet - like in some classifications but more towards the non - visible ultraviolet near this value for the lower limit of visible).

Answer:

• First question: Visible light
• Second question: \(700\) nm