Answer
The frequency of the microwaves in the oven is $2.5\times 10^9~Hz$
Work Step by Step
We can find the frequency of the microwaves in the oven:
$f = \frac{c}{\lambda}$
$f = \frac{3.0\times 10^8~m/s}{0.12~m}$
$f = 2.5\times 10^9~Hz$
The frequency of the microwaves in the oven is $2.5\times 10^9~Hz$
