Discussion
Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
Answer: C
The order is air, water, iron.
Speed is \(v = \sqrt{E/\rho}\), and the elastic modulus rises far more sharply from gas to liquid to solid than the density does. Sound travels at about \(343\ \mathrm{m\,s^{-1}}\) in air, \(1{,}500\) in water and \(5{,}100\) in iron.
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