A Light Beam from a 2

Multiple Choice

A light beam from a 2.1 mW He-Ne laser has wavelength of 633 nm.How many photons does the laser emit in one second?

A) 6.7 × 10¹⁵
B) 8.8 × 10¹⁵
C) 1.1 × 10¹⁶
D) 1.3 × 10¹⁶