connor50
How many photons are produced in a laser pulse of 0.819 J at 531 nm?



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aaronq
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find the energy given by one photon of that wavelength
E=hc/lambda
divide the energy given 0.819 J by the energy of one photon

connor50
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\[3.74 \times 10^37\]?

aaronq
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what energy did you get per photon

aaronq
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0.000000000374 = 3.74*10^10 J /photon

connor50
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Divide that that by .819?

aaronq
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the other way around
0.819 J/3.74*10^10 J = # of photons

connor50
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Ah.\[2.19\times10^9\]

aaronq
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that sounds right