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Oscillations

# The damping in a system

a.       Lowers the resonant frequency compared to natural frequency proportionally

b.      Increases the resonant frequency compared to  natural frequency

c.       Lowers the resonant frequency but as a nonlinear function

d.      Does not affect the resonant frequency

$w'= \sqrt {w_n^2-\large\frac{b^2}{4m^2}}$
Where $w_n$ is undamped natural frequency.
Thus $w' < w_n$
Hence 'c' is the correct answer.