Microwave ovens use microwave radiation to heat food. the energy of the microwaves is absorbed by water molecules in food and then transferred to other components of the food. typical microwaves have wavelength in the 10-12 cm range. suppose your microwave oven emits waves of length 11.2 cm. how many photons are required to heat 200 ml of water from 23oc to 95oc

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.