QuestionHow many photons are in a laser pulse with energy $7.53 \mathrm{~mJ}$ at a wavelength of $601 \mathrm{~nm}$? Use 3 sig figs.

Studdy Solution
Calculate the number of photons in the laser pulse.
$$Number\, of\, photons = \frac{7.53 \times10^{-3} \mathrm{~J}}{3.31 \times10^{-19} \mathrm{~J}} =2.27 \times10^{16}$$The laser pulse contains $2.27 \times10^{16}$ photons.