本题目来源于试卷: SoundSoundSoundSound，类别为 IB物理学
[问答题]
Standing waves can be said to be due to “interfer t9;rum4 6poewence in space,” whereas gylhz+z en 4. ::c6nwjbeats can be said to be du: z4y6wehn: z.cn +glje to “interference in time.” 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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