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P H Y S I C S Chapter 7: Waves and Vibrations Section 7D : Wave Behavior and Sound. Bell Ringer. Tell me about this wave: a. how many waves? b. wavelength, c. amplitude d. label crest and trough e. period f. frequency g. speed (v=f λ ). 40cm. t =10s. 50cm. Boundary Behavior. - PowerPoint PPT Presentation
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P H Y S I C SChapter 7: Waves and Vibrations
Section 7D: Wave Behavior and SoundBell RingerTell me about this wave: a. how many waves? b. wavelength, c. amplitude d. label crest and trough e. period f. frequency g. speed (v=f)
t=10s40cm50cm
1) Fixed End Reflection: Reflected pulse is inverted
Boundary BehaviorReflected PulseIncidentPulseBEFOREAFTER
2) Free End Reflection: Reflected pulse is not inverted
Boundary BehaviorReflected PulseIncidentPulseBEFOREAFTER
Wave Interference1) Constructive Interference: Amplitudes of wave pulses add togetherBeforeDuringAfterA + BABAB
Wave Interference2) Destructive Interference: Amplitudes of wave pulses subtractBeforeDuringAfterA - BABABStanding WavesResults from interference of multiple waves
Nodes destructiveAnti-Nodes constructive
Slinky DemonstrationBoundary Behavior: 1) Fixed End Reflection 2) Free End ReflectionInterference: 3) Constructive 4) Destructive 5) Standing Waves
Sound WavesSound waves are longitudinal waves
RarefactionCompressionBeatsAlternating constructive and destructive interference between two sound waves of different frequencies
Beats Applet
Doppler EffectDue to a moving source or observerCauses apparent shift in frequency
Doppler Effect Applet
24 Hz Wave + 24 fps Camera