Question

what is the wavelength of a microwave oven operation at a frequency of 2.45X10 to the power of 9 Hz (2.45 GHz)??

Answer 1

microwaves are electromagnetic waves, assuming speed equal to that of light in vacuum, c=299792458m/s
the frequency/wavelength relation is
\[\lambda = \frac{ v }{ f } = \frac{ c }{ f }\]
working out gives
\[\lambda = 0.12236 meter\]

Answer 2

thank you

Answer 3

there could be a small difference, for the waves who are in the air instead of vacuum, but generally one can use light speed of vacuum for air.