A metallic wire of length l is held between two supports under some...

A metallic wire of length $l$ is held between two supports under some tension. The wire is cooled through $\theta^{{}^{{}^{\circ}}}$. Let $Y$ be the Young's modulus, $\rho$ the density and $\alpha$ the thermal coefficient of linear expansion of the material of the wire. Therefore, the frequency of oscillations of the wire varies as