SOUND

Sound Waves longitudinal waves that can only travel through matter vibrating objects produce sound by moving molecules

Speed of Sound Speed of a sound wave increases as the material’s density increases ex. travel fastest through solids Speed of a sound wave increases as the temperature of the material increases ex. travel fastest through warmer materials

Sound and Pitch Frequency - amount of wavelengths that pass a point in one second; measured in Hertz (Hz) Pitch – the perception of how high or low a sound seems higher frequency = higher pitch lower frequency = lower pitch

Sound and Loudness Amplitude – depends on the amount of energy a wave carries higher amplitude compressions closer together, rarefactions farther apart more energy, louder sound lower amplitude compressions farther apart, rarefactions closer together less energy, softer sound

Sonar/Echolocation Sonar Echolocation reflected sound waves are used to locate underwater objects calculate the distance by using the time it takes the sound wave to reflect Echolocation method used by animals (ex. dolphins, bats) to locate prey

Ultrasound converts high-frequency sound waves to images of internal body parts called sonograms