1. Supported in part by NSF FHSU Physical Science

2. ENGAGE: How Does Sound Propagate?  Ideas:  Questions:

3. EXPLORE: We Can Make Sound Propagate??

4. EXPLAIN: Model Building  Is any motion needed in order for sound to propagate (that does not exist when sound does not propagate)?  If so, motion of what? What it is that moves for this purpose?  What kind of motion? How it (whatever moves) moves?  Is there anything that obstructs the motion?  How is this motion related to sound?

5. EXPLAIN: Model Building - Describing Model(s) Anything moves?If so, how? Relationship of this motion and sound?

6. 4 basic ideas on mechanisms of sound propagation Human characters = Air particles Footballs = Sound entities

7. REGROUP 4 basic mechanisms – 4 groups Human characters = Air particles Footballs = Sound entities

8. EXPLAIN: Reflecting Sounds  Test your model and modify it if necessary  Any modifications necessary?

9. EXPLAIN: Across a Barrier  Test your model and modify it if necessary  Any modifications necessary?

10. EXPLAIN: Sound And a Vacuum Demonstration  Test your model and modify it if necessary  Any modifications necessary?

11. EXPLAIN: Observing Interference  Test your model and modify it if necessary  Any modifications necessary?

12. EXPLAIN: Candle Flame Demonstration  Test your model and modify it if necessary  Any modifications necessary?

13. ELABORATE: Choosing the Model Anything moves?If so, how? Relationship of this motion and sound?

14. Wave Model Scientifically Accepted Model Independent Entity Dominant Alternative Model 4 basic ideas on mechanisms of sound propagation (+) Ear Born Sound Propagating Air Dependent Entity Hybrid Models

15. Drum http://www.le.ac.uk/se/centres/sci/selfstudy/ps84.gif

16. Sound is a pressure wave Animation: Individual particle motion

17. Hearing the sound http://www.ndt-ed.org/EducationResources/HighSchool/Sound/humanear.htm nc

18. Animations  http://webphysics.davidson.edu/physlet_resources/bu_semester1/c20_wave_propagation_sim.html http://webphysics.davidson.edu/physlet_resources/bu_semester1/c20_wave_propagation_sim.html  http://webphysics.davidson.edu/physlet_resources/bu_semester1/c20_trans_long.html http://webphysics.davidson.edu/physlet_resources/bu_semester1/c20_trans_long.html  http://phet.colorado.edu/new/simulations/index.php?cat=Sound_and_Waves http://phet.colorado.edu/new/simulations/index.php?cat=Sound_and_Waves 1. Animation: Individual particle motion 2. Candle movie 3. Phet animation

19. Sound exhibits wave properties Animation: Reflecting sounds http://www.ndt-ed.org/EducationResources/HighSchool/Sound/reflection.htm  Across a barrier – transmission  Propagation through medium and vacuum DVD: 9.15 (Longitudinal wave); 9.17 (Reflection)

20. “I say fifty, maybe a hundred horses… What you say, Red Eagle”

21. Sound Interference

22. http://www.ndt-ed.org/EducationResources/HighSchool/Sound/interference.htm

23. EVALUATE: The String Telephone Explain

24. EVALUATE: The String Telephone Explain

25. The String TelephoneDVD: 9.11

26. EXTEND: Speed of Sound  Problem: What is the speed of sound? or How fast does sound propagate?  What do we need to know to calculate speed? What is the equation we use for speed?  How might we measure the time it takes for the sound to propagate from the blocks to the wall and echo back from the wall to the blocks?

27. EXTEND: Speed of Sound The following table shows measured values in different media in meters per second. Use the table below together with your model of sound propagation to determine the relationship between the density of the media and the speed of sound in it.

28. Animations  Animation: Speed of sound in air Animation: Speed of sound in air  http://www.ndt-ed.org/EducationResources/HighSchool/Sound/speedinair.htm  Animation: Speed of sound in other materials Animation: Speed of sound in other materials  http://www.ndt-ed.org/EducationResources/HighSchool/Sound/speedinmaterials.htm http://www.ndt-ed.org/EducationResources/HighSchool/Sound/speedinmaterials.htm  Animation: Speed of sound and density Animation: Speed of sound and density  Downloadedstuff/WebPages/mass_spring_Lwave.html Downloadedstuff/WebPages/mass_spring_Lwave.html

29. References  Modes of Sound Wave Propagation  http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/Physics/modepropagation.htm http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/Physics/modepropagation.htm  Interference  http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/Physics/WaveInterference.htm http://www.ndt-ed.org/EducationResources/CommunityCollege/Ultrasonics/Physics/WaveInterference.htm  Speed of sound  http://www.ndt-ed.org/EducationResources/HighSchool/Sound/speedinair.htm http://www.ndt-ed.org/EducationResources/HighSchool/Sound/speedinair.htm  Drum sound production and reception; Compression wave pictures  http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l1b.html http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l1b.html  http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l1c.html http://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l1c.html