A cord of length 1.5 m is fixed at both ends. Its mass per unit length is

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A cord of length 1.5 m is fixed at both ends. Its mass per unit length is 1.2 g/m and the tension is 12 N. 

(a) What is the frequency of the fundamental oscillation? 

(b) What tension is required to make the n = 3 mode have a frequency of 0.50 kHz?

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