Question

Part A Alaser pulse with a wavelength of 510 nm contains 4.85 mJ of energy. How many photons are in the laser pulse? Express the number of photons numerically. View Available Hint(s) TE IVO ALDA ? N = Submit

Answer 1

Energy per photon (E)= hc where h= plank's constant = 6-62x16 4.s C = Velocity of light = 3x108 m/s x= wavelength = 51ohm = 510 x 10 m E = (6.62x10 34 J. S) x(3×108 m/s) (510x109 m) 19.86 x 1626 x J 5 10 x 10 -17 = 0.03894x10lt u E = 3.89 x 10-19 J No. of Photons = Totoy energy energy per photon 4.85 mu 3.8981019 J = 4.85 x 1030 3.89010195 Here I J = 10 m L - LT-1030 = 1.25X106 photong No. of Photons, (N = 1.25x106 103 N = (0%) N= 12,500000000000000 Photons