Enormous numbers of microwave photons are needed to warm macroscopic samples of matter. A portion of soup containing 330. g water is heated in a microwave oven from 30.°C to 90.°C, with radiation of wavelength 1.55 10-2 m. How many photons are absorbed by the water in the soup?
2007-11-20 06:55:19 · 1 answers · asked by Ruby Winter 2 in Science & Mathematics ➔ Chemistry
Break questions of this kind of down into chunks small enough to work with.
Heat energy absorbed by soup = energy supplied by microwaves
energy supplied by microwaves = energy per photon x number of photons
Photon energy = Planck's Constant x frequency
Frequency x wavelength = c
heat absorbed by soup = mass of soup x specific heat of soup (4.184 J g-1 degree-1) x change in temperature
You can now disarm this fearsome looking problem step-by-step
2007-11-20 08:45:41 · answer #1 · answered by Facts Matter 7 · 0⤊ 0⤋