PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics
Problem
In a laboratory experiment, a lightly damped oscillator is driven at a frequency equal to its natural frequency. If the damping of the system is gradually increased while keeping the driving frequency unchanged, what observable change occurs?
(a) The phase difference between displacement and force becomes zero
(b) The natural frequency increases proportionally
(c) The steady–state amplitude decreases steadily
(d) The steady–state amplitude remains the same