Ultrasound used in a particular medical imager has frequency 4.8 {MHz} and wavelength 0.31 {mm}. Find (a) the angular frequency, (b) the wave number,…

Ultrasound used in a particular medical imager has frequency 4.8 {MHz} and wavelength 0.31 {mm}. Find (a) the angular frequency, (b) the wave number, and (c) the wave speed.