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//Example 29.4
h=6.63*10^-34;//Planck's constant (J.s)
c=3*10^8;//Speed of light (m/s)
lambda=580*10^-9;//Wavelength (m)
P=0.1*100;//Power in visible light production, 10% of 100W, (W)
E=h*c/lambda;//Photon energy (J)
photons=P/E;//Number of visible photons per second (photons/s)
printf('Number of visible photons per second = %0.2e photons/s',photons)
//Openstax - College Physics
//Download for free at http://cnx.org/content/col11406/latest
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