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## Homework Statement

Longnitudal and transverse soundwaves in nickel (FCC lattice) moves at velocities 5300m/s 3800m/s. Determine the elastic constants C

_{ijkl}

## Homework Equations

[tex]v =\sqrt{C_{ij}/\rho}[/tex]

## The Attempt at a Solution

I guess I can calculate C

_{ij}with that equation....but I dont understand how I get the indices ij, or ijkl...And I dont understand how am I supposed to use the longnitudal AND transverse wave speeds....