Concept:Loudness of sound is directly related to the amplitude of the sound wave.
Explanation:Sound is a longitudinal mechanical wave.
Amplitude is the maximum displacement of particles from their mean position.
A larger amplitude means the wave carries more energy.
More energy results in a louder sound.
Frequency determines pitch, not loudness.
Speed of sound in a given medium is constant and does not affect loudness.
Pitch is the ear’s response to frequency, independent of loudness.
Thus, loudness depends only on the amplitude of the wave.
Answer:Option B: Its amplitude.