A student uses a 2.00-m-long steel string with a diameter of 0.90 mm for a standing wave experiment. The tension on the string is tweaked so that the second harmonic of this string vibrates at 25.0 Hz.
(a) Calculate the tension the string is under.
(b) Calculate the first harmonic frequency for this string.
(c) If you wanted to increase the first harmonic frequency by 50%, what would be the tension in the string?