After the first encounter, the reflected pulse travels backwards through the heavy string with amplitude and width . The transmitted pulse has amplitude and speed . Its temporal duration is unchanged at the stationary junction, so its spatial width doubles to . Both pulses retain the original displacement sign.
Figure 1.
Pulse splitting, inversion at the fixed wall and the first return through the junction
. Original compact-pulse examples with incident width 0.4 metres. The junction is at zero and the fixed wall at two metres; amplitudes are normalized by the initial heavy-string pulse amplitude. Details.

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