Solve this following


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


  1. $2.5 \mathrm{kHz}$

  2. $10 \mathrm{kHz}$

  3. $7.5 \mathrm{kHz}$

  4. $5 \mathrm{kHz}$

Correct Option: , 4


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