FM23 P12 Q20 Phase Difference over time | Feb/March 2023 | Cambridge A Level 9702 Physics

9702/12/F/M/23: In a progressive water wave, two particles, P and Q, on the surface of the water, are a fixed horizontal distance apart. P and Q oscillate vertically. At time t = 0, the wave is as shown. Which graph best represents the variation with time t of the phase difference φ between the oscillation of the water particle P and the oscillation of the water particle Q?
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[@dewr98]

Really good video!!