List of top Physics Questions on Waves asked in Rajasthan PMT

A point source emits sound equally in all directions in a non-absorbing medium. Two points $P$ and $Q$ are at distances of $2\, m$ and $3\, m$ respectively from the source. The ratio of the intensities of the waves at $P$ and $Q$ is

If the equation of motion of standing waves is $y=0.3 \sin (314\, t-1.57\, x)$, then the velocity of standing wave will be :