Calculate the velocity of sound in a solid.
The speed of sound in a solid is calculated from the solid density and bulk modulus.
`a = √(K / ρ) `
where :
a = speed of sound
K = bulk modulus
ρ = density
The bulk modulus can be calculated from the elastic modulus and Poisson's ratio, or from the speed of sound in the solid.
`K = a^2 ρ `
`K = E / (3 (1 - 2 γ )) `
where :
E = elastic modulus
γ = Poisson ratio
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