Diagram 1 shows the variation with position of the displacement of a standing wave formed on a strin

Описание к видео Diagram 1 shows the variation with position of the displacement of a standing wave formed on a strin

Diagram 1 shows the variation with position of the displacement of a
standing wave formed on a string.
Diagram 2 shows the variation with position of the displacement of a
travelling wave moving to the right along a string.
Points P, Q, R and S are points on the string.
What is the phase difference between P and Q and the phase
difference between R and S?

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