A Laser Emits a 5

Multiple Choice

A laser emits a 5.0 × 10³-J pulse of light that has a wavelength of 480 nm. Determine the number of photons in the pulse.

A) 5.2 × 10¹⁶
B) 2.5 × 10¹⁹
C) 1.2 × 10²²
D) 3.1 × 10²²
E) 8.1 × 10²⁴