The energy carried by a single photon of frequency f is given by:
where
is the Planck constant. In our problem, the frequency of the photon is 
, and by using these numbers we can find the energy of the photon:
where
A classroom is about 3 meters high, 20 meters wide and 30 meters long. If the density of air is 1.29 kg/m3, what is the mass of
2 answers:
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