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Partial Differential Equations : Wave Equations

Study concepts, example questions & explanations for Partial Differential Equations

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Example Questions

Example Question #2 : Partial Differential Equations

Which of the following describes the physical phenomena that is the wave equation?

Possible Answers:

$\bigtriangledown^2u=f(x,y,z)$

$u_{tt}-c^2(u_{xx}+u_{yy}+u_{zz})=0$

$u_t-k(u_{xx}+u_{yy}+u_{zz})=0$

$u_{xx}+u_{yy}+u_{zz}=0$

$u_{tt}+c^2\bigtriangledown^4u=0$

Correct answer:

$u_{tt}-c^2(u_{xx}+u_{yy}+u_{zz})=0$

Explanation:

When dealing with partial differential equations, there are phenomenons in the physical world that have specific equations related to them in the mathematical world.

Looking at the possible answer selections below, identify the physical phenomena each represents.

$u_t-k(u_{xx}+u_{yy}+u_{zz})=0$ is known as the heat equation.

$u_{tt}-c^2(u_{xx}+u_{yy}+u_{zz})=0$ is known as the wave equation.

$u_{xx}+u_{yy}+u_{zz}=0$ is known as the Laplace equation.

$\bigtriangledown^2u=f(x,y,z)$ is known as the Poisson equation.

$u_{tt}+c^2\bigtriangledown^4u=0$ is known as the biharmonic wave equation.

Therefore, the correct answer for the wave equation is

$u_{tt}-c^2(u_{xx}+u_{yy}+u_{zz})=0$

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Partial Differential Equations : Wave Equations

Study concepts, example questions & explanations for Partial Differential Equations

All Partial Differential Equations Resources

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Example Question #2 : Partial Differential Equations

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