Discussion
Damping is provided in a seismometer in order to
Answer: B
Correct answer: stop the mass oscillating at its own natural period
An undamped suspended mass would ring at its own natural period after any disturbance, so the record would show the instrument’s oscillation superimposed on the ground motion. Damping - usually electromagnetic and set close to 0.7 of critical - suppresses that free oscillation while leaving the response flat over the widest possible band. Damping reduces the sensitivity slightly; that is the price of a faithful record.
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