The two graphs represent the same wave. Graph 1 shows the variation with time of the displacement at a particular distance. Graph 2 shows the variation with distance of the displacement at one instant. [Figure showing Graph 1 (displacement vs time, period 1.0 s) and Graph 2 (displacement vs distance, wavelength 90 cm)] What is the speed of the wave?
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✓ Correct answer
D: 120 cm s⁻¹
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