SOLVED:Predict/Calculate For a science experiment, you would like to use the Doppler effect to double the perceived frequency of a harmonica, from the 261.7-Hz tone (middle C) that it emits, to 523.3 Hz (C5 note). (a) Which strategy will accomplish your goal. more easily: move the harmonica, or move the observer? (b) Calculate the speed the harmonica must have in order for a stationary observer to hear 523.3 Hz (c) Calculate the speed an observer must have in order to perceive a 523.3-Hz sound f