Problem 6.184

Find the number of natural transverse vibrations of a rightangled parallelepiped of volume $V$ in the frequency interval from $\omega$ to $\omega+d \omega$ if the propagation velocity of vibrations is equal to $v$

d N_{\omega}=\left(V / \pi^{2} v^{3}\right) \omega^{2} d \omega

Molecules and Crystals