Household microwave ovens commonly operate at a frequency of 2.45 GHz. Consider a single photon of this radiation interacting with a gaseous water molecule.
(a) Determine the wavelength corresponding to 2.45 GHz radiation.
(b) Calculate the energy of one photon of this radiation in kJ mol⁻¹.
(c) Using the numerical result from part (b), decide which type of molecular energy level (rotational, vibrational, or electronic) is most directly affected. Justify your choice with reference to typical energy scales for molecular transitions.