In the figure, a string, tied to a sinusoidal oscillator at P and running over a support at Q, isstretched by a block of mass m. Separation L = 1.4 m, linear density = 0.8 g/m, and the oscillatorfrequency f= 140 Hz. The amplitude of the motion at P is small enough for that point to beconsidered a node. A node also exists at Q.(a) What mass m allows the oscillator to set up the fourth harmonic on the string?(b) What standing wave mode, if any, can be set up if m= 3 kg (Give 0 if the mass cannot set up astanding wave)?Oscillator(a) NumberiUnits(b) NumberiUnitsM

Length of string (L)=1.4m ,linear density=0.8g/m ,f=140Hz n=4

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