In the figure, a string, tied to a sinusoidal oscillator at Pand running over a support at Q, is stretched by a block of mass m. Separation L = 1.2 m, linear density u = 1.7 g/m, and the oscillator frequency f = 140 Hz. The amplitude of the motion at Pis small enough for that point to be considered a node. A node also exists at Q. (a) What massmallows the oscillator to set up the fourth harmonic on the string? (b) What standing wave mode, if any, can be set up if m = 2 kg (Give O if the mass cannot set up a standing wave)? Oscillator (a) Number Units (b) Number i Units

In the figure, a string, tied to a sinusoidal oscillator at Pand running over a support at Q, is stretched by a block of mass m. Separation L = 1.2 m, linear density u = 1.7 g/m, and the oscillator frequency f = 140 Hz. The amplitude of the motion at Pis small enough for that point to be considered a node. A node also exists at Q. (a) What massmallows the oscillator to set up the fourth harmonic on the string? (b) What standing wave mode, if any, can be set up if m = 2 kg (Give O if the mass cannot set up a standing wave)? Oscillator (a) Number Units (b) Number i Units