A progressive wave of frequency 50 Hz is travelling with velocity 350 m/s through a medium. The change in phase at given time interval of 0.01s is

When a sonometer wire vibrates in the third overtone, the number of antinodes and nodes formed on the wire are respectively

When the observer moves towards a stationary source with velocity '$V_1$', the apparent frequency of the emitted note is '$F_1$'. When the observer moves away from the source with velocity '$V_1$', the apparent frequency is '$F_2$'. If 'V' is the speed of sound in air and $F_1/F_2 = 2$, then $V/V_1 =$

The equation of wave motion is $Y = 6\sin\left(12\pi t - 0.02\pi x + \dfrac{\pi}{3}\right)$ where x is in metre and time in second. The velocity of the wave is