Phase Difference
Imagine two pendulums swinging with a time period T for one complete cycle of 2 seconds. If one pendulum is 0.5 seconds behind the other one then the phase difference is a quarter of a cycle. Since one cycle is 2π radians, the phase difference will be ½π or (0.5/2.0) × 2π

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All 9 lessons in Simple Harmonic Motion · All Edexcel A-level Physics topics