A String Is Stretched with a Tension of 120 N $\times$

A string is stretched with a tension of 120 N.The string has a length of 2.5 meters.The velocity of wave propagation along the string is 220 m/s.The mass per unit length of the string is

A) 5.8 $\times$ 10^-3 kg/m.
B) 5.0 $\times$ 10^-3 kg/m.
C) 4.2 $\times$ 10^-3 kg/m.
D) 3.7 $\times$ 10^-3 kg/m.
E) 2.4 $\times$ 10^-3 kg/m.

Correct Answer:

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