A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 0.5 mW. How many photons are emitted each second?
1
2.6 × 1018
2
4.8 × 1017
3
3.3 × 1016
4
1.6 × 1015
5
Question Not Attempted
A helium-neon laser emits red light having a wavelength of 632.8 nm and a power of 0.5 mW. How many photons are emitted each second?