Two particles are oscillating along two close parallel straight lines… | NEET 2011 (AIPMT, Mains)

Q69NEET 2011 · AIPMT · MAINSMedium

Periodic Motion & SHM Basics

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

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Answer: (c)

At $x = \frac{A}{2}$ : $\sin\phi = \frac{1}{2}$ , so $\phi = \frac{\pi}{6}$ or $\frac{5\pi}{6}$ .
Moving in opposite directions means one has $\cos\phi > 0$ ( $\frac{\pi}{6}$ ) and the other $\cos\phi < 0$ ( $\frac{5\pi}{6}$ ).
$\Delta\phi = \frac{5\pi}{6} - \frac{\pi}{6} = \frac{2\pi}{3}$
So the answer is (c) $\frac{2\pi}{3}$ .

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