Sound is described as a LONGITUDINAL wave because:
ASound waves have a long wavelength
BSound waves travel a long distance
CParticles of the medium vibrate PARALLEL to the direction of wave propagation
DSound is a transverse oscillation
Answer & Solution
Correct answer: C. Particles of the medium vibrate PARALLEL to the direction of wave propagation
In a longitudinal wave, particles oscillate back-and-forth along the same line as the wave is travelling. In sound waves, this back-and-forth produces alternating compressions and rarefactions in the air. Compare with light (transverse): light's electric and magnetic fields oscillate PERPENDICULAR to its propagation direction.
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