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Two particles are oscillating along two close parallel straight lines side by side, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean positions of the two particles lie on a straight line perpendicular to the paths of the two particles. The phase difference is

1. 0
2. 2π/3
3. π
4. π/6

Correct answer: π

Solution

The two particles pass each other moving in opposite directions when their displacement is half the amplitude. This indicates that their oscillations are out of phase by π radians, as one particle is moving forward while the other is moving backward at the same displacement.

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