\fA light spring is stretched on the oor. Two students do a series of trials to determine what happens when two pulses meet as theyr travel along the spring. in each trial. each of the students, at opposite ends of the spring, simultaneously create a pulse. These puises travel along the spring in opposite directions so that they arrive at the midpoint of the spring at the same time. The puises that the students create are of different amplitudes and iengths. After observing the interactions of several trials. which of these conclusions couid the students make about the interaction of the pulses? Select one: 0 a. When the pulses meet they oombine and then create two new pulses that are identical to each other and that move away from the midpoint in opposite directions. O b. When the pulses meet, theyr bounce off each other and move back toward the student who created each puise. O c. When the two pulses meet, they pass through each other and continue on their way, seemineg unaffected by the interaction with the other pulse. 0 d. When the two pulses meet. they combine to form a single pulse that is a combination of the two onginai pulses. The combined pulse moves away in the direction of the pulse with the greater amplitude. Which ef the following ccinditicins are required for two waves to create a standing wave in a spring? |.The waves must be travelling in opposite directions. ll.The waves must have equal amplitudes. lll.The waves must have equal wavelengths. Select cine: O a. land II only C} is. land Ill only C} c. II and ill only G d. I, ii, and Ill