1. Calculate the velocity of the wave, in terms of l. and f, when the string is vibrating in the segments. First give the velocity in symbolic form and then calculate the actual value. 2. Suppose the pulley absorbs a significant fraction of the energy in the wave so that the amplitude of the reflected wave is not equal to the amplitude of the wave set up by the vibrator. How will the standing waves differ from those established under conditions of perfect reflec-tion? Hint: Remember what happens to the nodes when you add two waves of different am-plitude. Will their superposition give zero amplitude