What phenomenon occurs when two objects naturally vibrate at the same frequency?

Resonance occurs when two objects naturally vibrate at the same frequency, leading to an amplification of the sound produced. This phenomenon is a fundamental concept in physics and audio engineering. When an external force matches the natural frequency of an object, it causes that object to vibrate with greater amplitude, resulting in a more pronounced sound.

For example, if you push a swing at its natural frequency, the swing goes higher with each push. This principle is critical in the design of musical instruments, where specific frequencies enhance sound production. Additionally, resonance plays an important role in hearing instruments, as they are designed to amplify specific frequencies to match an individual's hearing loss, allowing for clearer sound perception.