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OpenStudy (anonymous):
How many photons are produced in a laser pulse of 0.447 J at 539 nm?
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OpenStudy (ipwnbunnies):
Find the energy of one photon: \[E = \frac{hc}{\lambda}\] Divide the total energy by the energy of one photon. That'll give you the total number of photons.
OpenStudy (ipwnbunnies):
Whoops, where 'h' is Planck's constant, c is the speed of light in whichever medium you're considering in meters/sec, and lambda is the wavelenth of light in meters.
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