JEE Main PAPER - 1

A granite rod of $60\text{ cm}$   length is clamped at its middle point and is set into longitudinal vibrations. The density of granite is $2.7 \times 10^{3}\text{ kg/m}^{3}$   and its Young's modulus is $9.27 \times 10^{10}\text{ Pa}$  . What will be the fundamental frequency of the longitudinal vibrations?