Which of the following are true?
1. The mechanical energy of a damped, undriven oscillator decreases exponentially with time.
2. Resonance for a damped, driven oscillator occurs when the driving frequency exactly equals the natural frequency.
3. If the Q factor of a damped oscillator is high, then its resonance curve will be narrow.
4. The decay time τ for a spring-mass oscillator with linear damping is independent of its mass.
5. The Q factor for a driven spring-mass oscillator with linear damping is independent of its mass.