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1

Two simple harmonic motions are given by
\( \mathrm{P} \) \( y_{1}=a \sin \left[\left(\frac{\pi}{2}\right) t+\phi\right] \) and \( y_{2}=b \sin \left[\left(\frac{2 \pi}{3}\right) t+\phi\right] \).

W
The phase difference between these after \( 1 \mathrm{~s} \) is
(1) Zero
(2) \( \frac{\pi}{2} \)
(3) \( \frac{\pi}{4} \)
(4) \( \frac{\pi}{6} \)
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