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]
When a sound wave passes from air into wayngm, 0 ubjlq9 cxik ty l762iag 3+c,/map)u,ter, do you expect tl 7xcj99/ hkcserud-b/3z ;kt he frequency or wavelength to ;/bud txskjezr9c3 / lh-c79kchange?
参考答案: If
the frequency were to change, the two media could not stay in contact with each
other. If one medium vibrates with a
certain frequency, and the other medium vibrates with a different frequency,
then particles from the two media initially in contact could not stay in
contact with each other. But particles
must be in contact in order for the wave to be transmitted from one medium to
the other, and so the frequency does not change. Since the wave speed changes in passing from
air into water, and the frequency does not change, we expect the wavelength to
change. The wave travels about four
times faster in water, so we expect the wavelength in water to be about four
times longer than it is in air.
本题详细解析:
暂无
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