physics

[Given: $h=6.625×10_{−34}J−s$]

use this equation to calculate energy per photon

$E=λhc $

where

E = energy per photon

h = planks constant $=6.626×10_{−34}$ J . sec

c = speed of light $=3.00×10_{8}$ m/s

$λ$ = wavelength $=1500$ nm $=1500nm×(10_{9}nm1m )=1.500×10_{−}6$ m

so that

E / photon $=(1.500×10_{−}6m)(6.626×10_{−34}J.sec)×(3.00m/sec) =1.325x10_{−19}$ J / photon

Since 1 W = 1 J / sec, we just convert to photons per sec using that E/photon

$(1.325×10_{−19}J1photon )×(1W1J/sec )×(0.12×100W)=9.03×10_{50}$ photons / sec

Hence $x$ = 9 (approx)

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