[Answer] Compressional or Longitudinal

Answer: he particles of a medium vibrateback and forth in the same
direction(parallel) to the direction in which the waves travel.
Compressional or Longitudinal
Mechanical longitudinal waves are also called compressional or compression waves because they produce compression and rarefaction when traveling through a medium and pressure waves because they produce increases and decreases in pressure.
Longitudinal/Compressional waves travel back and forth or parallel to the direction the wave travels. Places where the particles of the medium are pushed together are called compressions. Places where the particles of the medium are pulled apart are called rarefactions.
Mechanical longitudinal waves are also called compressional or compression waves because they produce compression and rarefaction when traveling through a medium and pressure waves because they produce increases and decreases in pressure.
Definition of compressional wave. : a longitudinal wave (such as a sound wave) propagated by the elastic compression of the medium. — called also compression wave.
Compressional wave definition is – a longitudinal wave (such as a sound wave) propagated by the elastic compression of the medium —called also compression wave.
Longitudinal waves are waves in which the vibration of the medium is parallel to the direction the wave travels and displacement of the medium is in the same direction of the wave propagation. Mechanica…

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