Part O

The light from a red laser pointer has wavelength $6\mathrm{.}35107$m$6\mathrm{.}35107$m$$in vacuum. When this light is sent into a transparent material with relative permeability $1\mathrm{.}00,$ its wavelength decreases to $3\mathrm{.}47107$m$3\mathrm{.}47107$m$.$ Find the frequency of the light in vacuum.

Express your answer with the appropriate units.