<P> Electromagnetic radiation is characterized by its wavelength ( or frequency ) and its intensity . When the wavelength is within the visible spectrum ( the range of wavelengths humans can perceive , approximately from 390 nm to 700 nm ) , it is known as `` visible light '' . </P>
<P> Electromagnetic radiation is characterized by its wavelength ( or frequency ) and its intensity . When the wavelength is within the visible spectrum ( the range of wavelengths humans can perceive , approximately from 390 nm to 700 nm ) , it is known as `` visible light '' . </P>
the color of visible light can be determined by frequency or
the color of visible light can be determined by frequency or
Electromagnetic radiation
Electromagnetic radiation