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 from a stationary harmonica that emits sound at 261.7 Hz.
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