Sound waves are longitudinal mechanical waves that can travel through solids, liquids, or gases.
- The speed v of a sound wave in a fluid having bulk modulus B and density ρ is, \(v = \sqrt {\frac Bρ} \)
- The speed of longitudinal waves in a metallic bar is, \(v = \sqrt {\frac Yρ} \)
- For gases, since B = γP, the speed of sound is, \(v = \sqrt {\frac {Pγ}ρ} \)
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1 and 2
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2 and 3
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1 and 3
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1, 2, 3 all are correct.