How many photons are produced in a laser pulse of 0.896 J at 489 nm?
E = hv
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C = v
v = C/
E = hC/
= 489nm = 489*10^-10 m
E = 6.625*10^-34 * 3*10^8/489*10^-10
= 4.064*10^-18 J
no of photons = 0.896j* photon/4.064*10^-18J = 1.93*10^17 photons