Multiple choice

The loudness of sound is determined by its

  1. frequency

  2. wavelength

  3. amplitude

  4. resonance

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Loudness of sound is determined by its amplitude - the greater the amplitude of vibration, the louder the sound. Frequency determines pitch, wavelength is the distance between wave crests, and resonance is a phenomenon that amplifies sound but doesn't determine loudness.