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Why must traveling waves have the same amplitude to form a standing wave?

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3 2 $begingroup$ I understand the reason for which the wavelengths of the incident and reflected waves must be equal: otherwise, the interference at any fixed position would be constructive at some instants and destructive at others. But why can't two waves of differing amplitude produce a standing wave? waves share | cite | improve this question asked 7 hours ago Julia Kim Julia Kim 37 4 $endgroup$ ...