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For longitudinal waves,

Correct answer: C. The particles of the medium oscillate along the direction of the wave's propagation

  • A. The particles of the medium oscillate perpendicular to the wave's propagation
  • B. The particles of the medium remain stationary as the wave passes through
  • C. The particles of the medium oscillate along the direction of the wave's propagation
  • D. Their velocity is enhanced when they travel through vacuum

Explanation

The particles of the medium oscillate along the direction of the wave's propagation in a longitudinal wave.

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About Waves

Progressive waves transfer energy through oscillations, with wavelength, frequency, amplitude and wave speed related by v = fλ; sound speed depends on the medium. Superposition produces interference and stationary waves in strings and organ pipes, while simple harmonic motion describes the oscillation itself and must be distinguished from wave propagation.

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