Click the Restart Button and then the Pulse Button. Watch the pulse travel to the right, reflect, and travel to the left.

Next, click the Restart Button and select "Loose End" in the upper-right corner. (You will send another pulse down the string. But, before you do, predict what will happen.)

Click the Pulse Button. Again, watch the pulse travel to the right and reflect.

What did you observe?

Question

Click the Restart Button and then the Pulse Button. Watch the pulse travel to the right, reflect, and travel to the left.

Next, click the Restart Button and select "Loose End" in the upper-right corner. (You will send another pulse down the string. But, before you do, predict what will happen.)

Click the Pulse Button. Again, watch the pulse travel to the right and reflect.

What did you observe?

BlackTom AI · Accepted Answer

The prompt describes a pulse traveling along a string and reflecting at two different boundary conditions: a fixed end and a loose end. First, consider what happens at a fixed end: when a wave pulse reaches a boundary that cannot move, the boundary enforces zero displacement. To satisfy this condition, the incoming pulse must invert when it reflects, resulting in a reflected pulse that is upside down relative to the incident pulse.

Next, examine the loose (or free) end: here the end can move, and the boundary condition is that the slope or tension at the end must be such that the displacement is maximized at the boundary. In this case, the reflected pulse does not invert; instead, it returns upright, preserving the pulse’s orientation relative to the direction of travel. This is because the free end allows the string to move in step with the reflected wave, so there is no sign change.

In the observable sequence described—pulse approaching a fixed end, reflecting inverted, then pulse encountering a loose end and reflecting upright—the contrasting boundary conditions produce the expected inversion at the fixed end and no inversion at the loose end.

If one were to consider alternative statements about these reflections, a claim that a fixed end would never invert or that a loose end would invert would conflict with the boundary-condition reasoning: fixed ends impose a sign change to satisfy zero displacement, while loose ends do not impose such a sign change. By comparing these two scenarios, the observed behavior aligns with standard wave-reflection theory on strings.

Additionally, uncertainties could arise if the end conditions were not perfectly rigid or perfectly loose, or if damping and dispersion in the string were significant; however, under idealized conditions described in the experiment, the inversion at the fixed end and the upright reflection at the loose end are the expected outcomes.

In summary, the key distinction is that a fixed boundary enforces a reversal of the pulse upon reflection, while a free boundary preserves the pulse orientation, leading to an upright reflected pulse at the loose end.

PHYS 2306 Lab - Summer Session 2 - 2025 Pre-lab Assignment: Lab 2

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