A physics student holds a small battery operated device used for tuning instruments that emits the frequency of middle C (262 Hz) while walking with a constant speed of 3.23 m/s toward a building which presents a hard smooth surface and hence reflects sound well. (Use 343 m/s as the speed of sound in air.)
(a) Determine the beat frequency the student observes between the device and its echo.
(b) Determine how fast the student must walk away from the building in order to observe a beat frequency of 4.59 Hz.
