Question

What is the frequency of a photon with a wavelength of 159 nm

Answer 1

The frequency of a photon is calculated by the formula:

$\lambda=\tfrac{c}{\nu}$ , where $с=3*10^8$ m/s.

A wavelength in nm translate to m:

159 nm = $1.59*10^{-7}$ m.

$\lambda=\tfrac{3*10^8}{1.59*10^{-7}}=1.88*10^{15}$ Hz.

Answer: $1.88*10^{15}$ Hz.