Distance between two points at a given phase difference on the wave y = A sin(wt + kx)

1. A.
   $\frac{\pi}{8}\,m$
2. B.
   $\frac{\pi}{9}\,m$
3. C.
   $\frac{\pi}{6}\,m$
4. D.
   $\frac{\pi}{3}\,m$

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1. A.
   $\dfrac{\pi}{4}$
2. B.
   $\dfrac{\pi}{8}$
3. C.
   $\dfrac{\pi}{16}$
4. D.
   $\dfrac{\pi}{32}$

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1. A.
   $\dfrac{\pi}{6}$ m
2. B.
   $\dfrac{\pi}{9}$ m
3. C.
   $\dfrac{2\pi}{9}$ m
4. D.
   $\dfrac{\pi}{18}$ m

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