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

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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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