Physics, 28.07.2019 23:00 bbbbbbbbbbbb62

Which of these would be best explained by the doppler effect? a) the change in frequency as you shorten a guitar string. b) the change in pitch heard as an ambulance approaches you. c) the change in volume as a train pulls away from the station. d) the change in speed of a sound wave as it travels from air into water

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Which of these would be best explained by the doppler effect? a) the change in frequency as you sho...