Frequency and amplitude.
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The amplitude of a sound wave is what you perceive as loudness. A larger amplitude corresponds to a louder sound, while a smaller amplitude corresponds to a softer sound.
The amplitude (The height of the wave) of the wave increases as the sound gets louder.
The higher the frequency of a sound wave, the higher the pitch of the sound perceived by the human ear.
No
The amplitude of a sound corresponds to its loudness so an increase in amplitude will correspond to a louder sound.