To find out how force (or pressure) waves recoil from a rigid termination, we may convert velocity waves to force (or pressure) waves by means of the Ohm's law relations of Eq.(6.6) for strings (or Eq.(6.7) for acoustic tubes), and then use Eq.(6.12), and then Eq.(6.6) again:

Thus, force (and pressure) waves reflect
from a rigid termination with *no sign inversion*:^{7.3}

The reflections from a rigid termination in a digital-waveguide acoustic-tube simulation are exactly analogous:

Waveguide terminations in acoustic stringed and wind instruments are
never perfectly rigid. However, they are typically *passive*,
which means that waves at each frequency see a reflection coefficient
not exceeding 1 in magnitude. Aspects of passive ``yielding''
terminations are discussed in §C.11.

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