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A tuning fork is struck, and the tips of the prongs (tines)
are initially displaced 0.4 mm from their natural position
at rest. The prongs oscillate at 440 Hz under damped
harmonic motion. The sound is no longer audible once
the displacement is less than 0.1 mm. What is the
damping factor if the sound is no longer audible after
4.0 sec? Round to 2 decimal places.

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