The systems such as strings and air columns undergo forced oscillation. If the external frequenc...

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The systems such as strings and air columns undergo forced oscillation. If the external frequency of oscillation for forced oscillation is close to one of the natural frequencies, then the system is said to be in
(a) resonance
(b) fundamental mode of oscillation
(c) simple harmonic motion
(d) Both (a) and (b)
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