The elastic constants of solids are significant for both fundamental and practical reasons. Fundamentally, elastic constants represent the second derivatives of a thermodynamic potential concerning strain, directly linking them to atomic bonding and structure (Federov 1968) . They provide critical information about a material's stability, stiffness, brittleness, ductility, and anisotropy. The elastic modulus (C 2D ) for longitudinal strain in the x and y directions of the longitudinal acoustic wave is calculated using parabolic fitting of the equation