In the figure below, a string, tied to a sinusoidal oscillator at P and running

Question

In the figure below, a string, tied to a sinusoidal oscillator at P and running over a support at Q, is stretched by a block of mass m. The separation L between P and Q is 1.70 m, and the frequency f of the oscillator is fixed at 120 Hz. The amplitude of the motion at P is small enough for that point to be considered a node. A node also exists at Q. A standing wave appears when the mass of the hanging block is 286.1 g or 643.7 g, but not for any intermediate mass. What is the linear density of the string?
answer in g/m

Explanation / Answer

.151

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