How many photons of green light with a wavelength of 500 nm are necessary to have a total energy of 1.0 $\mu$J?

Question

Quizplus · Accepted Answer

The energy of a single photon is given by E = hc/\lambda, where h is Planck's constant, c is the speed of light, and \lambda is the wavelength. Substituting the given values, we get E = (6.626 x 10^-34 J s)(3 x 10^8 m/s)/(500 x 10^-9 m) = 3.98 x 10^-19 J. To find the number of photons needed for a total energy of 1.0 $\mu$J, we divide 1.0 $\mu$J by the energy of a single photon: (1.0 x 10^-6 J)/(3.98 x 10^-19 J/photon) = 2.51 x 10^12 photons.

How Many Photons of Green Light with a Wavelength of 500