A pulsed laser emits light in a series of short pulses, each having a duration of 44.0 ms. The average power of each pulse is 6.00 mW, and the wavelength of the light is 633 nm. a. Find the number of photons in each pulse.
b. Find the energy of each pulse.

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.