The amplitude of vibration of a particle is given by ${a_m} = ({a_0})/(a{\omega ^2} - b\omega + c);$ where ${a_0},a,b$ and $c$ are positive. The condition for a single resonant frequency is
  • A${b^2} = 4ac$
  • B${b^2} > 4ac$
  • C${b^2} = 5ac$
  • D${b^2} = 7ac$
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