Answer:

2.Pitch

3.Decibel

4.Vibration

Explanation:

2.How high or low a sound seems to a listener is its pitch. Pitch, in turn, depends on the frequency of sound waves. High-frequency sound waves produce high-pitched sounds, and low-frequency sound waves produce low-pitched sounds. Infrasound has wave frequencies too low for humans to hear.

3. decibel (dB)

Loudness refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity, or amount of energy, in sound waves. The unit of intensity is the decibel (dB). As decibel levels get higher, sound waves have greater intensity and sounds are louder.

4.vibration. the rapid back and forth movement of matter that may produce sound.

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Answer:

2. Pitch

3. Frequency

4.Vibration

Explanation: