The microwave radiation is absorbed by moisture in the food. Microwaves are used to heat food in microwave ovens. This heats the water, and, as the water becomes hot so does the food.
Determine how many photons having a wavelength, λ, of 3.00 mm would have to be absorbed to heat 150. ml of water (~ 1 tea cup) from the 55.0 °F to boiling (212°F)? Suppose the density of water is 1.00 g/mL for the temperature range considered.
Planck's constant h = 6.626×10-34 J sec. The specific heat capacity of water = 4.184J/g° C. The speed of light is 3.00×108 m/s.