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P H Y S I C S Chapter 7: Waves and Vibrations Section 7D : Wave Behavior and Sound

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.

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P H Y S I C S Chapter 7: Waves and Vibrations Section 7D : Wave Behavior and Sound

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  1. P H Y S I C S Chapter 7: Waves and Vibrations Section 7D: Wave Behavior and Sound

  2. 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=fλ) 40cm t=10s 50cm

  3. Boundary Behavior • 1) Fixed End Reflection: Reflected pulse is inverted AFTER BEFORE Incident Pulse Reflected Pulse

  4. Boundary Behavior • 2) Free End Reflection: Reflected pulse is not inverted AFTER BEFORE Incident Pulse Reflected Pulse

  5. Wave Interference • 1) Constructive Interference: Amplitudes of wave pulses add together A B Before A + B During A B After

  6. Wave Interference • 2) Destructive Interference: Amplitudes of wave pulses subtract A Before B A - B During A After B

  7. Standing Waves • Results from interference of multiple waves • Nodes  destructive • Anti-Nodes  constructive

  8. Slinky Demonstration • Boundary Behavior: 1) Fixed End Reflection 2) Free End Reflection • Interference: 3) Constructive 4) Destructive 5) Standing Waves

  9. Sound Waves • Sound waves are longitudinal waves Compression Rarefaction

  10. Beats • Alternating constructive and destructive interference between two sound waves of different frequencies Beats Applet

  11. Doppler Effect • Due to a moving source or observer • Causes apparent shift in frequency Doppler Effect Applet

  12. 24 Hz Wave + 24 fps Camera

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