A particle of mass $m$ moves in a one-dimensional potential energy $U(x) = -ax^2 + bx^4,$ where $'a'$ and $'b'$ are positive constants. The angular frequency of small oscillations about the minima of the potential energy is equal to
  • A$\pi \,\sqrt {\frac{a}{{2b}}} $
  • B$2\,\sqrt {\frac{a}{m}} $
  • C$\sqrt {\frac{{2a}}{m}} $
  • D$\sqrt {\frac{a}{{2m}}} $
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