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If frequency of an external forced oscillation is equal to the natural frequency of the body, then amplitude of the forced oscillation of the body becomes very large. This phenomenon is known as resonant vibration.

1. Resonant vibration
2. Forced vibration
3. Natural vibration
4. Damped vibration

Correct answer: Resonant vibration

Solution

When the frequency of an external force matches the natural frequency of a system, the system oscillates with maximum amplitude. This phenomenon is called resonance or resonant vibration.

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