Question

Resonance occurs, when? 

Options

• a body vibrates at a frequency lower than its normal frequency.

• a body vibrates at a frequency higher than its normal frequency.

• a body is set into vibrations with its natural frequency, by another body vibrating with the same frequency.

• a body is made of the same material as the sound source.

Answer 1

a body is set into vibrations with its natural frequency, by another body vibrating with the same frequency.

Explanation:

When two bodies vibrate at the same frequency, resonance causes one to be aroused and the other to vibrate at its natural frequency.