A Solid State Pulsed Laser Has an Energy of 400

Multiple Choice

A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 × 10−⁶ m, how many photons are in each pulse?

A) 2 × 10²⁵
B) 2 × 10²¹
C) 3 × 10¹⁸
D) 6 × 10³⁸
E) 2 × 10¹⁸