When does resonance occur? when the frequency of a forced vibration equals the natural frequency when the frequency of a forced vibration is greater than the natural frequency when two waves of the same frequency interfere when two waves of slightly different frequencies interfere nextreset

Resonance = When the frequency of a forced vibration equals the natural frequency

Explanation:

Resonance occurs when the frequency at which the force is applied becomes equal to the natural frequency of the system on which it acts. At resonance, the system will oscillate with larger amplitude. The frequency at which resonance occurs is called resonant frequency.

Hence, the correct option is (a) " when the frequency of a forced vibration equals the natural frequency ".

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