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What would the phase difference between P and Q be? I assumed that because they are 1/4 of a wavelength apart, it would be Pi/2, but supposedly the difference is 0.

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  • $\begingroup$ The phase difference is zero. $\endgroup$ – KV18 Apr 22 at 9:22
  • $\begingroup$ @KV18 but why is that? $\endgroup$ – Olly Scargill Apr 22 at 9:23
  • $\begingroup$ Have a look at this simulation and observe what is happening to the particles between nodes. $\endgroup$ – Farcher Apr 22 at 9:28
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Both $P$ and $Q$ have the same amplitudes at the same time. That is because the combining waves have no phase difference between them at that point.

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  • $\begingroup$ Right so in a standing wave points like that have 0 phase difference. I see $\endgroup$ – Olly Scargill Apr 22 at 9:31

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