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Pages: 60
Year: 2006
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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