The diagram shows a displacement-distance graph for a progressive transverse wave traveling along a wire at a given instant.
The wave starts at x=0x = 0x=0 and first crosses the equilibrium axis going downwards at x=4.0 cmx = 4.0\text{ cm}x=4.0 cm. Two particles on the wave are labeled PPP (at x=1.0 cmx = 1.0\text{ cm}x=1.0 cm) and QQQ (at x=4.0 cmx = 4.0\text{ cm}x=4.0 cm).
What is the phase difference between particle P P\,P and particle QQQ?
π4 rad\frac{\pi}{4}\text{ rad}4π rad
3π4 rad\frac{3\pi}{4}\text{ rad}43π rad
5π4 rad\frac{5\pi}{4}\text{ rad}45π rad
3π2 rad\frac{3\pi}{2}\text{ rad}23π rad