What is the number of photons of light with a wavelength of 4000 pm that provide 1 J of energy?

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2.145×1014 photons

2.0122×1016 photons

2.0012×1010 photons

2.0233×108 photons

answer is B.

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Detailed Solution

Energy, E=hcλ=6.626×10-34Js×3.0×108 ms-14000×10-12 m 1pm=10-12 m=4.9695×10-17 JNumber of photons, N=1 J4.9695×10-17 J =2.0122×1016 photons

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