A simple harmonic progressive wave is represented by the equation : $y = 8\sin 2\pi (0.1x - 2t)$ where $x$ and $y$ are in $cm$ and $t$ is in seconds. At any instant the phase difference between two particles separated by $2.0 \,cm$ in the $x-$direction is ..... $^o$
  • A$18$
  • B$36$
  • C$54$
  • D$72$
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