A uniform wire, fixed at both ends, is plucked in the middle so that it vibrates at the first harmonic as shown.
What is the phase difference between the oscillations of the particles at P and Q?

zero
2 )
$\frac{\pi }{4}$rad
3 )
$\frac{\pi }{2}$rad
4 )
$\frac{{3\pi }}{4}$rad
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