Question

Electromagnetic radiation with a wavelength of 700 nm would be:

a)x-rays
b)red light
c)violet light
d)ultraviolet light
e)microwaves

I thought it would be visible light but that's not an option.

Answer 1

Red and violet are both visible. Red would fit.


Color Frequency Wavelength
violet 668–789 THz 380–450 nm
blue 631–668 THz 450–475 nm
cyan 606–630 THz 476–495 nm
green 526–606 THz 495–570 nm
yellow 508–526 THz 570–590 nm
orange 484–508 THz 590–620 nm
red 400–484 THz 620–750 nm