A laboratory string is 1.50 m long and has a total mass of 12 g. One end is fixed, and the other end is attached to a device that maintains a constant tension of 45 N.
(a) Calculate the speed at which a small transverse pulse travels along the string.
(b) Determine the time required for the pulse to travel from the fixed end to the tensioning device and then return to the fixed end after reflecting once, assuming no energy losses.
(c) If the tension were suddenly reduced to 20 N with all other quantities unchanged, by what factor would the round-trip time calculated in part (b) change? Explain your reasoning briefly.