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[Phy] 想問下longitudinal wave 有冇momentarily at rest?

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想問下longitudinal wave 有冇momentarily at rest?

如題..
em46em46em46
如果係,係幾時先係momentrarily at rest
搞到好混亂..
   

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有...
最高同最低果粒...

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如果係中間既話..
向下就係point of compression..
而向上就係point of rarefraction

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how about transverse wave
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引用:
原帖由 kiyiptsang 於 2011-1-7 10:13 PM 發表
如果係中間既話..
向下就係point of compression..
而向上就係point of rarefraction
Centre of compression
同rarefraction都唔係momentarily at rest
佢地係displacement係0..
下面呢2題

第一題答案係  K
第二題答案係 (1) only
我真係諗爆頭都唔明呢2題
附件: 您所在的用戶組無法下載或查看附件

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回覆 1# grasp 的帖子

have this..you can find it by considering disp-dist grah

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Que 2

For (1), the particle is in a destructive interference, so there will not be any crest or trough formed->at rest
For (2)&(3), the particles are in constructive interference, there will be amplified crest and trough formed, instead of at rest. What appears to be crest and trough in the graph is only at that moment. As wave propagates, there will be respective crest and trough formed.
PS.How can I earn the 積分here? I'm in desperate need of al pastpaper but the site requires me to obtain at least 2 marks.Thx for answering

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引用:
原帖由 2383 於 2011-1-7 10:58 PM 發表 how about transverse wave
When  the direction of the particle of the crest and trough change, the particle will experiment momentarily at rest at that moment.

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有rarefaction or compression最外果粒就係

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