A certain microwave oven delivers 750. watts (joule/s) of power to a coffee cup containing 51.4 g of water at 25.0°C. If the wavelength of microwaves in the oven is 9.75 cm, how many photons must be absorbed to make the water boil? The specific heat capacity of water is 4.18 J/°C · g and assume only the water absorbs the energy of the microwaves.
