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Longitudinal waves are best exemplified by

AWaves on a string
BElectromagnetic waves
CSound waves in air
DWater surface waves
Answer & Solution
Correct answer: C. Sound waves in air
1. Longitudinal waves have particle motion parallel to wave direction. 2. Sound waves are longitudinal in fluids (air, water) due to compressions and rarefactions. 3. Waves on a string are transverse (perpendicular motion). 4. EM waves are transverse (E and B perpendicular to propagation). _Source: syllabus Physics, Ch 14 "Waves", §14.2_
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