Question

In a vacuum all colors of light travel at a speed of 3 x 10^8 m/sec. The HeNe laser emits a red color with a wavelength of 633 nm. What is the frequency of this light?

Answer 1

The frequency of the light of red color would be equal to
f = c/ λ = 3 x 10⁸ / 633 x 10^-9 = 4.7 x 10¹⁴ Hz.