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OpenStudy (anonymous):
How many photons are produced in a laser pulse of 0.548 J at 669 nm?
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OpenStudy (anonymous):
Number of photons = 0.548 J / Energy of each photon Energy of each photon = Planck's Constant * frequency frequency = speed of light / wavelength Speed of light = 3.00 * 10^8 Wavelength = 669 nm or 669 * 10^-9 m Planck's Constant = 6.63*10^-34 J*s Calculate frequency, then energy of each photon, then number of photons.
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