試題詳解

複選題
22. Consider a damped harmonic oscillator, which of the following is true?
(A) If it is underdamped, the resonant frequency increases with larger damping；
(B) If it is underdamped, the amplitude decays faster with larger damping；
(C)If it is underdamped, and is driven by an external sinusoidal force, the amplitude of the oscillation is maximum if the frequency of the force is the same as the resonance frequency；
(D) In order to damp the kinetic energy and the elastic energy as fast as possible, one should design the oscillator to be at critical damping condition；
(E) If it is overdamped, the system does not oscillate and returns to the equilibrium position slowly.