g A sound wave with an intensity of i0 has an intensity level of 12 dB. What would be the intensity level of the sound wave if the intensity increased to 10 x i0

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.