A sound source emits an audible frequency of 512 Hz. Which would cause a greater Doppler shift in measured frequency at the observer?                 Group of answer choices a. The observer traveling toward a stationary source at 40 m/s. b. The source traveling toward the stationary observer at 40 m/s. c. The source and observer each traveling at 20 m/s toward each other. d. All of these will be the same shift in frequency.

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