The sharpness of resonance or Q value of resonant circuit with resonant frequency `f_(r)` and half power frequency `f_(1) and f_(2)` is

Options

A. `Q=(f)/(f_(2)-f_(1))`
B. `Q=(f_(2)-f_(1))/(f_(r))`
C. `Q=(f_(r))/(f_(2)+f_(1))`
D. `Q=(1)/(f_(r)(f_(2)-f_(1)))`

Answer

A