Two masses m1 and m2 are connected by a massless spring of spring constant k. The system is free to oscillate along the length of spring. The system oscillates with a frequency.

• A. \(\frac{1}{{2\pi }}\sqrt {\frac{k}{\mu }} \;where\;\mu = \left( {\frac{{{m_1}{m_2}}}{{{m_1} + {m_2}}}} \right)\)
• B. \(\sqrt {\frac{\mu }{k}} \;where\;\mu = \left( {\frac{{{m_1}{m_2}}}{{{m_1} + {m_2}}}} \right)\)
• C. \(\sqrt {\frac{k}{\mu }} \;where\;\mu = \left( {\frac{{{m_1}{m_2}}}{{{m_1} + {m_2}}}} \right)\)
• D. \(\frac{1}{{2\pi }}\sqrt {\frac{\mu }{k}} \;where\;\mu = \left( {\frac{{{m_1}{m_2}}}{{{m_1} + {m_2}}}} \right)\)