Question

if the visible portion of the spectrum is from 400 to 800 nm then the frquency associated with 400 nm is
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Answer 1

Answer:

Visible light is usually defined as having wavelengths in the range of 400–700 nanometers (nm) or one billionth of a meter. EM waves are categorized according to their wavelengths and frequencies (number of waves passing a point in a certain time)