posted by Kez .
microwave ovens work by irradiating food with microwaves, which is absorbed by the water molecules in the food and is converted into heat. Assuming that microwave ovens emit radiation with a wavelength of 12.2cm, calculate how many photons are emitted per second in a 1000-Watt microwave oven.
1000 watts = 1000 joules/second
E = hc/wavelength
E = 6.626E-34*3E8/12.2E-2 for one photon.
1.6E-24 J/photon x # photons = 1000 joules/sec.
Solve for # photons.