# Question & Answer: How many photons are produced in a laser pulse of 0.896 J at 489 nm?…..

How many photons are produced in a laser pulse of 0.896 J at 489 nm?

E = hv

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C = v$\lambda$

v    = C/$\lambda$

E   = hC/$\lambda$

$\lambda$   = 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