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qq wen da 9
Pages: 60
Year: Issue:  3
Journal: School Journal of Mathematics

Keyword:  钢架传播速度声音渔舟唱晚空气响声回忆钢铁间隔时间;
Abstract: <正>网友“回忆”问:甲在钢架的一端敲了一下,乙在钢架的另一端听到两次响声,这两次响声间隔0.82s,这个钢架的长度大约是多少米?“渔舟唱晚”答:已知声音在钢铁中的传播速度为5200m/s,在空气中的传播速度为340m/s.设钢架长为l.则声音在钢架中传播所用的时间为t_钢=l/5200m/s, 声音在这段路程的空气中传播所用的时间为l/340m/s.由题给条件可知: l/340m/s-l/5200m/s=0.82s
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