The equation of the wave is $Y = 10 \sin \left(\frac{2 \pi t}{30} + \alpha\right)$. If the displacement is $5 \text{ cm}$ at $t = 0$,then the total phase at $t = 7.5 \text{ s}$ will be (Given: $\sin 30^{\circ} = 0.5$)

  • A
    $\frac{\pi}{3} \text{ rad}$
  • B
    $\frac{\pi}{2} \text{ rad}$
  • C
    $\frac{2 \pi}{5} \text{ rad}$
  • D
    $\frac{2 \pi}{3} \text{ rad}$

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