## Chemistry: The Central Science (13th Edition)

The frequency of that light is $5.635\times10^{14}s^{-1}$.
*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 $\nu=\frac{c}{\lambda}=\frac{2.998\times10^8}{5.32\times10^{-7}}\approx5.635\times10^{14}s^{-1}$