[Thuận] [làm bạn vá»›i hình làm tình vá»›i chữ] [những câu đố toán há» c kiểu nháºt] [Hồi kàcao văn viên] [Ä‘Ãââ%C3] [Vị giÃ�] [trương duyệt nhiên] [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] [kỉ luáºÂt bản thân] [楽因金èÂ�·å¨œ 在线æ’Âæâ€�¾]