One end of a horizontal string of 0.40 mg/m mass per unit length is attached to a small-amplitude mechanical 60 Hz vibrator. The string passes over a pulley, a distance L = 2.5 m away, and weights are hung from this end. Assume the string at the vibrator is a node, which is nearly true. The mass that must be hung from the end of the string to produce three loops of a standing wave is
A) 800 g.
B) 400 g.
C) 100 g.
D) 40 g.
E) 10 g.

Question

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The Answer of One end of a horizontal string of 0.40 mg/m mass per unit length is attached to a small-amplitude mechanical 60 Hz vibrator. The string passes over a pulley, a distance L = 2.5 m away, and weights are hung from this end. Assume the string at the vibrator is a node, which is nearly true. The mass that must be hung from the end of the string to produce three loops of a standing wave is
A) 800 g.
B) 400 g.
C) 100 g.
D) 40 g.
E) 10 g.

One End of a Horizontal String of 0