1(i)
Free vibrations are :
- (a)the vibrations under the influence of a periodic force.
- (b)the vibrations with larger amplitude.
- (c)the vibrations when the frequency continuously decreases.
- (d)the vibrations with a constant frequency and constant amplitude.
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the vibrations with a constant frequency and constant amplitude
Reason — The periodic vibrations of constant amplitude and frequency of a body in the absence of any external force on it, are called free vibrations.