What medium has the slowest propagation speed?

• A. Bone
• B. Air
• C. Muscle
• D. Liver

Answer: (B)

The medium with the slowest propagation speed among those listed is air. In general, sound waves travel fastest in solids, slower in liquids, and slowest in gases. This is because the particles in solids are closely packed together, allowing them to transmit sound waves more efficiently through elastic collisions.

Bone is a dense solid with tightly packed molecules, which contributes to a high propagation speed. Muscle is a soft tissue, but it generally still allows for faster sound transmission than gases due to its liquid-like behavior. The liver, while also a soft tissue composed mostly of liquid, does not provide as much resistance to sound propagation as air does.

In contrast, air, being a gas, has a much lower density and the particles are more dispersed compared to solids and liquids, resulting in a slower speed of sound. This illustrates the principle that the density and state of matter (solid, liquid, gas) impact how quickly sound can travel through a medium.