Study GuidePhysics–Waves and Sound1.SoundHow Sound Waves Are ProducedSound is created when an objectvibrates. When an object vibrates, it moves back and forth. As itmoves:•Itpushes air molecules together→ this is called acompression•Itpulls air molecules apart→ this is called ararefactionOne compression plus one rarefaction makesone complete longitudinal sound wave.In sound waves:•Air molecules moveback and forth•Their motion isparallel to the direction the wave travels•Energy is passed from one molecule to the nextThis is how sound travels from the source to your ears.1.Intensity and PitchPitch (How High or Low a Sound Is)Pitch depends onfrequency,which means how many vibrations happen each second.•More vibrations per second →Higher pitch (high note)•Fewer vibrations per second →Lower pitch (low note)Preview Mode
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