[54 năm] [Teor] [tÃÂÂÂch phân] [ vương] [Truyện sex 18] [U��������,�-f] [N%A8%AEi sao cho tr] [cây cối] [���ݧѧۧ�] [flute player hears four beats per second when she compares her note to a fC = 523 Hz tuning fork (thenote C). She can match the frequency of the tuning fork by pulling out the tuning joint and lengthening thepipe of the flute slightly. What was the flute player’s initial frequency ff]