What is the frequency of green light that has a wavelength of 531 nm? (c = 3.00 x 10⁸ m/s)

Answer 1

First off, the equation that we need is:

speed = c = frequency * wavelength = f * ƛ.

So, the frequency = f = speed / wavelength

= c / ƛ = (3.00 x 10⁸ m/s) / (531 nm)

= (3 x 10⁸ m/s) / (531 x 10⁻⁹ m)

= 3/531 x 10¹⁷ / s = 3000/531 x 10¹⁴ Hz

≈ 5.65 x 10⁵ GHz.