Sound is described as a LONGITUDINAL wave because:
AIts frequency is always longer than 20 hertz
BIts wavelength is always longer than its amplitude
CParticles oscillate parallel to wave direction
DParticles oscillate perpendicular to wave direction
Answer & Solution
Correct answer: C. Particles oscillate parallel to wave direction
In a longitudinal wave, particles of the medium oscillate PARALLEL to the direction of wave travel. This creates alternating compressions and rarefactions.
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