Question

The ultraviolet light that causes suntans (and sunburns!) has a typical wavelength of 300 nm. what is the frequency of these rays?

Answer 1

Using the formula:
v = fλ, where v is the speed of the wave, f is its frequency and λ is its wavelength.
The speed of ultraviolet light is equal to that of light. Therefore:
f = v/λ
f = 3 x 10⁸ / 300 x 10⁻⁹
f = 1 x 10¹⁵ Herz