# chemistry

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A certain microwave oven delivers 800. watts (J/s) of power to a coffee cup containing 45.0 g of water at 25.0°C. If the wavelength of microwaves in the oven is 9.75 cm, how long does it take, and how many photons must be absorbed, to make the water boil?

• chemistry -

heat=45*specificheatwater*(212-25) figure that out.

time=heatabove/800

energyineach photon=f*plancksconst
but f=c/lambda
so figure the energy in each photons

number of photons=heat to heat water/energyineach photon

• chemistry -

12

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