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

1. aaronq

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

2. connor50

$3.74 \times 10^-37$?

3. aaronq

what energy did you get per photon

4. aaronq

0.000000000374 = 3.74*10^-10 J /photon

5. connor50

Divide that that by .819?

6. aaronq

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

7. connor50

Ah.$2.19\times10^9$

8. aaronq

that sounds right

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