Which characteristic of the reflected pulse from a string tied to a movable ring is correct?

When a pulse travels along a string and reaches a boundary where the string is tied to a movable ring, the characteristics of the reflected pulse need to be analyzed based on the nature of the boundary. In this case, since the boundary (the ring) is movable, it allows for the free movement of the end of the string.

When the pulse reflects off a movable boundary, it does not undergo an inversion. This means that if the original pulse is a crest, the reflected pulse will also be a crest, maintaining its original shape. This non-inverting behavior differs from what typically occurs at a fixed boundary, where the reflected wave would be inverted.

Moreover, the amplitude of the reflected pulse remains the same as that of the incident pulse. Therefore, if the incident pulse has an amplitude of A, the reflected pulse will also have an amplitude of A, ensuring that energy is conserved in this system.

In summary, for a string attached to a movable ring, the reflected pulse remains non-inverted and retains the same amplitude as the incident pulse, leading to the conclusion that the correct characterization of the reflected pulse is that it is non-inverted with amplitude A.