A Piano Wire of Length 1

Multiple Choice

A piano wire of length 1.5 m vibrates so that one-half wavelength is contained on the string. If the frequency of vibration is 65 Hz, the amplitude of vibration is 3.0 mm, and the density is 15 g/m, how much energy is transmitted per second down the wire?

A) 21 W
B) 11 W
C) 5.4 W
D) 2.2 W
E) 1.1 W