The displacement of two sinusoidal waves is given by the equations:
$y_1 = 8 \sin(20x - 30t)$
$y_2 = 8 \sin(25x - 40t)$
Then the phase difference between the waves at time $t = 2 \ s$ and distance $x = 5 \ cm$ will be:

  • A
    $2 \ \text{radian}$
  • B
    $3 \ \text{radian}$
  • C
    $4 \ \text{radian}$
  • D
    $5 \ \text{radian}$

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