2. Propagation of diverging spherical waves
2.1 The three-dimensional wave equation
Generalizing the equations established for plane waves to three-dimensional media leads us to consider the three components ρ0 dx dy dzfx, ρ0 dx dy dzfy and ρ0 dx dy dzfz of the resultant of external forces.
The equation of state remains unchanged: p = c2ρ.
The Euler equation, which for one-dimensional media could have been written as :
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Propagation of diverging spherical waves
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