本题目来源于试卷: gc textbook chapter 12 Sound，类别为 通用国际物理
[问答题]
Standing waves can be said to be due t63wdea y vao0) k3ykatx p20.so “i )(aqq-)ej1wf y ,m1n ejmbt2unterference in space,” whereas beats can be said to be due to “interference in -we)y(1j ,e2nb f1 jua)qqmt mtime.” Explain.
参考答案: The
wave pattern created by standing waves does not “travel” from one place to
another. The node locations are fixed in
space. Any one point in the medium has
the same amplitude at all times. Thus
the interference can be described as “interference in space” – moving the
observation point from one location to another changes the interference from
constructive (anti-node) to destructive (node).
To experience the full range from node to anti-node, the position of
observation must change, but all observations could be made at the same time by
a group of observers.
The wave pattern created by beats does
travel from one place to another. Any
one point in the medium will at one time have a 0 amplitude (node) and half a
beat period later, have a maximum amplitude (anti-node). Thus the interference can be described as
“interference in time”. To experience
the full range from constructive interference to destructive interference, the
time of observation must change, but all observations could be made at the same
position.
本题详细解析:
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