Question
A microwave oven produces electromagnetic radiation in the radio portion of the spectrum. These microwave photons are absorbed by water molecules, resulting in an increase in the molecules’ rotational energies. This added energy is transferred by heat to the surrounding food, which as a result becomes hot very quickly. If the energy absorbed by a water molecule is $1.0\times 10^{-5}\textrm{eV}$, what is the corresponding wavelength of the microwave photons?
1. 1.22 GHz
2. 2.45 GHz
3. 4.90 GHz
4. 9.80 GHz
(b)
Solution Video