Sound travels through a solid (like a wooden ruler) MORE easily than through air mainly because:
ASolids are heavier, so they reflect sound back
BParticles in solids are packed close together, so vibrations pass from one to the next more efficiently
CAir has no particles
DSolids are colder than air
Answer & Solution
Correct answer: B. Particles in solids are packed close together, so vibrations pass from one to the next more efficiently
Sound propagates by particles passing on their vibration to neighbouring particles. In solids the particles are tightly packed and bonded, so vibrations are transmitted very efficiently — that's why an ear pressed against a long wooden table picks up scratching at the far end clearly. In gases, particles are far apart, so transmission is less efficient.
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