IB Waves sl Diagram 1 below shows the displacement of part of a medium through w

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IB Waves sl
Diagram 1 below shows the displacement of part of a medium through which a wave is travelling at time t=0. Diagram 2 shows the displacement at a later time t= 4s in which the wave has moved forward 10 cm. In this time, the point P on the wave has moved 10 cm. In this time, the point P on the wave has moved from a crest through zero displacement to a trough. The wavelength of the wave is: 5 cm, 10 cm, 20 cm, 40 cm ?

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