GACE Physics Practice Exam 2026 - Free Physics Practice Questions and Study Guide

In the context of wave mechanics, resonance occurs when an external force or frequency matches the natural frequency of a system. This leads to a significant increase in the amplitude of oscillation. When resonance happens, the energy supplied by the external force efficiently transfers to the oscillating system, causing the system to vibrate with greater intensity.

This phenomenon can be observed in various systems, such as a swing being pushed at just the right moments to achieve larger and larger swings, or in musical instruments where specific frequencies produce louder sounds. The condition of resonance ensures that even small periodic forces can result in large oscillations due to constructive interference of the waves in the system.

The other choices, while they relate to mechanical systems or electrical circuits, do not accurately describe the main outcome of resonance. The increase in amplitude of oscillation is the hallmark of resonance, demonstrating how energy can be maximized when the driving frequency corresponds with the natural frequencies of the system.