NEET UG PHYSICS MCQ: WAVES

Equations of a stationary wave and a travelling wave are ${y_1} = a\,\,\sin \,\,kx\,\,\cos \,\,\omega t$ and ${y_2} = a\,\,\sin \left( {\omega t - kx} \right)$. The phase difference between two points ${x_1} = \frac{\pi }{{3k}}$ and ${x_2} = \frac{{3\pi }}{{2k}}$are ${\phi _1}$ and ${\phi _2}$ respectively for the two waves. The ratio ${\phi _1}/{\phi _2}$ is