A receiver and a source of sonic oscillations of frequency `v_(0) = 2000 Hz` are located along the x-axis. The source swings simple harmonically along the axis with a constant frequency and amplitude `a = 50 cm`. If the frequency band -width registered by the stationary receiver is `Delta v = 200 Hz`, find the value of oscillation frequency of the source. Speed of sound in air `= 340 m s^(-1)`
