Question

The wavelength of green light from a traffic signal is about 520 nm. Calculate the frequency and wave number of this radiation.

Answer 1

Wave number ($\overline{\lambda }$) = $\frac{1}{\lambda }$

=$\frac{1}{520}n{m}^{-1}$

Wave number ($\overline{\lambda }$) $=1.92\times {10}^{-3}n{m}^{-1}$

Frequency (f)=$\frac{c}{\lambda }$

$\frac{3\times {10}^8}{520\times {10}^{-9}}$ Hz

Frequency (f) $=5.77\times {10}^{14}$Hz