A Helium-Neon Laser Emits Light of Wavelength 632 $\times$ 10¹⁴
B)2

Multiple Choice

A helium-neon laser emits light of wavelength 632.8 nm and has a power output of 1.5 mW.How many photons are emitted per second by this laser?

A) 1.34 $\times$ 10¹⁴
B) 2.56 $\times$ 10¹⁵
C) 3.09 $\times$ 10¹⁵
D) 4.22 $\times$ 10¹⁵
E) 4.78 $\times$ 10¹⁵