. A 2 m length of wire is made of steel (density 6 g.cm³) and has a diameter of 1 mm. a. Calculate its linear density u. (Hint: choose any length L and divide its mass by the length.) b. Calculate the tension it must be placed under if, when fixed at both ends, the fifth harmonic (j = 5) of the standing waves has a frequency of 250 Hz. c. Calculate the wavelength of the wave in the previous part.