Grade 11 Physics Practice Exam 2026 - Free Grade 11 Physics Practice Questions and Study Guide

Loudness is tied to how big the pressure fluctuations are in a sound wave. The bigger the amplitude of the wave, the more energy it carries to the surroundings, and the louder it sounds to our ears. The period and frequency describe how often the wave repeats and the pitch, not how loud it is, and speed depends on the medium through which the sound travels, not its loudness. So, the property that increases when a sound gets louder is the amplitude.