Let’s review interference and nodes for a minute…
How waves interact with each other depends on whether the waves are in phase or not. If they are in-step (in phase) with each other, then it’s easy to add up to double the displacement (constructive interference). If they are completely out of step, then they cancel each other out (destructive interference). We’ve seen this for transverse waves, but what about compression waves, like for sound waves?
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