Answer
The frequency of that light is $5.635\times10^{14}s^{-1}$.
Work Step by Step
*Strategy:
To find frequency when you already know the wavelength of radiation, you should follow this formula $$c=\lambda\times\nu$$
$c$ : speed of light in vacuum (therefore, $c\approx2.998\times10^{8}m/s$)
$\lambda$: wavelength of radiation
$\nu$: frequency of radiation
- Step 1: Find the known variables
A pointer emits light with a wavelength of $532nm$; therefore, $\lambda=532nm=5.32\times10^{-7}m$.
- Step 2: Find the frequency ($\nu$) of that light
$\nu=\frac{c}{\lambda}=\frac{2.998\times10^8}{5.32\times10^{-7}}\approx5.635\times10^{14}s^{-1}$
