An object of mass $m$ is suspended at the end of a massless wire of length $L$ and area of cross-section $A$. The Young's modulus of the material of the wire is $Y$. If the mass is pulled down slightly,its frequency of oscillation along the vertical direction is:
- A$f = \frac{1}{2 \pi} \sqrt{\frac{YA}{mL}}$
- B$f = \frac{1}{2 \pi} \sqrt{\frac{YL}{mA}}$
- C$f = \frac{1}{2 \pi} \sqrt{\frac{mA}{YL}}$
- D$f = \frac{1}{2 \pi} \sqrt{\frac{mL}{YA}}$
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