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

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