How many photons are produced in a laser pulse of 0.366 j at 508 nm

We know that

E = hν

Where

E = energy of one photon

h = Planck's constant = 6.626x10^-34 J s  

ν = frequency

the relation between frequency and wavelength and speed of light is

ν = c / λ

Where c = speed of light = 3.00x10^8 m/s  

λ = wavelength = 508 nm = 508 X 10^-9 m

Putting values to get energy of each photon

E = hc / λ = (6.626x10^-34 J s) x (3.00x10^8 m/s) / 508x10^-9 m = 3.91 X 10^19 J

Number of photons = energy given / energy of each photon

Number of photons = 0.366 J / 3.91 X 10^19 J = 9.36 X 10^17

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