Question $4$

A typical microwave oven operates at a frequency of $2\mathrm{.}45$ GHz $.$ What is the wavelength associated with the electromagnetic waves in the oven?

$8\mathrm{.}20$ m

$12\mathrm{.}2$ cm

$1\mathrm{.}20{10}^{8}m$

$8\mathrm{.}20{10}^{-9}$

m

none of those answers