Answer: Sharpness of resonance (ratio of resonant frequency to bandwidth).
- A Sharpness of resonance (ratio of resonant frequency to bandwidth)
- B The maximum amplitude reached at the resonant frequency
- C The phase angle between driving force and displacement at resonance
- D The raw damping coefficient of the oscillator in its equation of motion
Correct answer: A. Sharpness of resonance (ratio of resonant frequency to bandwidth)
Explanation: Q = ω_0/Δω (resonant frequency / bandwidth). A high Q means sharp resonance, low damping, and long decay time.
In SHM, displacement and velocity are 90° out of phase (v is maximum when x=0, and zero when x is extreme), while acceleration is always exactly opposite in sign to displacement, consistent with a = −ω²x.
Concept context
Simple harmonic motion, spring-mass, pendulum, energy in SHM, and resonance.