Mechanical Waves and Sound

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Mechanical Waves and Sound

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Presentation transcript:

Mechanical Waves and Sound Ch. 17 Intro to Physics

Mechanical Waves Energy source cause vibration Medium – material wave travels through

Types of Mechanical Waves Transverse Vibration perpendicular to direction

Type of Mechanical Waves Longitudinal Vibration parallel to direction Surface Only at surface

Properties of Mechanical Waves Periodic – regular repetition by time Period Frequency Hertz (Hz) Wavelength

Properties Continued Wave Speed Amplitude Speed = wavelength x frequency Speed = wavelength/period P. 506 Amplitude Energy relationship

Behavior of Waves Reflection Refraction Bounce off Speed and frequency same Can flip Refraction Bend in new medium Angled entry

Behavior Continued Diffraction Interference Bending due to obstacle Around or through opening Interference Waves overlap and combine Constructive increase Destructive Decrease P. 511

Standing Waves Appears to stay in one place Video Nodes Antinode Stationary Antinode Between nodes Crest or trough Video

Sound Longitudinal Waves Intensity Loudness Frequency How quickly wave’s energy flows Decibel (dB) Loudness Frequency Speed of vibration Pitch Length, tightness

Sound Ultrasounds and Sonar Doppler Effect Sirens Racetrack

Resonance Constructive interference Same frequencies together Soundboards