[ThuáºÂÂÂÂt zá» thế] [KHÔNG CHỐN NƯƠNG THÂN] [trần hạo cÆ¡] [许诺诺牧宁池第几章在一起 filetype:pdf] [flute player hears four beats per second when she compares her note to a fC = 523 Hz tuning fork (the note C). She can match the frequency of the tuning fork by pulling out the tuning joint and lengthening the pipe of the flute slightly. What was the flute player’s initial frequency ff ?] [프롬창고] [эѡ] [Qe] [tuổi sắt đá] [Bạch huyết]