The frequency of the light beam is 4.72 x 10¹⁴ Hz.
The frequency of light beam and wavelength of light is related in the following equations;
c = fλ
where;
f = c/λ
f = (3 x 10⁸) / (636 x 10⁻⁹)
f = 4.72 x 10¹⁴ Hz
Thus, the frequency of the light beam is 4.72 x 10¹⁴ Hz.
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