A light spring is stretched on the floor. Two students do a series of trials to determine what happens when two pulses meet as they travel along the spring. In each trial, each of the students, at opposite ends of the spring, simultaneously create a pulse. These pulses travel along the spring in opposite directions so that they arrive at the midpoint of the spring at the same time. The pulses that the students create are of different amplitudes and lengths. After observing the interactions of several trials, which of these conclusions could the students make about the interaction of the pulses? Select one O a. When the pulses meet, they bounce off each other and move back toward the student who created each pulse O b. When the pulses meet, they combine and then create two new pulses that are identical to each other and that move away from the midpoint in opposite directions. O c. When the two pulses meet, they combine to form a single pulse that is a combination of the two original pulses. The combined pulse moves away in the direction of the pulse with the greater amplitude. O d. When the two pulses meet, they pass through each other and continue on their way, seemingly unaffected by the interaction with the other pulse