Answer, wavelength is [tex] 1.25 \times 10^8 [/tex] nm.
The frequency of the microwave is, f = 2.40 GHz.
To Find frequency use the formula:
[tex] c=f [/tex]λ
Where, c is the speed of electromagnetic wave or light.
f is the frequency, and λ is the wavelength of light.
Rearranging,
[tex] \lambda = \frac{c}{f} [/tex]
Plug in the values,
[tex] \lambdam = \frac{3 \times 10^8 m/s}{2.40 GHz\frac{10^9 Hz}{1 GHz}}
=0.125 m\frac{10^9 nm}{1 m} = 1.25 \times 10^8 nm. [/tex]