The Question: A girl swings a buzzer round her head on a string 1.5 m long. If the buzzer emits a note of frequency 700 Hz and takes 0.5 s to make one revolution:
(a) what frequency is heard by the girl
(b) what frequency is heard by a friend standing a little over 10 m away
(c) what would happen to the observed frequency if the friend walked towards the girl?
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