2008+-+6*+Physics+HP

=America's Next Top Science Rockers!!=

Topics we should learn about/Topics to discuss
1 - How to describe a wave* 2 - types of instruments 3- how to amplify sound 4. why do guitar frets get closer together higher up* 5 how does "mosquito sound" work* 6. How do you tune an instrument 7.What types of materials amplify sound the best + What materials and what shapes amplify the best 8. The range of frequency humans can hear* 9.What determines a note* 10. How do echoes work 11. How do resonance 12. What are acoustics and how do you engineer them 13. Where do you place the holes to make certain notes 14. How does the thickness and tension of a string effect frequency* 15. How do different types of sounds in the same key sound different* 16. Why do major keys sound happy and minor keys sound depressing 17. How do vibrations turn into loud sounds* 18. How do noise canceling headphones work 19. How do ears work 20. How does sound travel* 21. sensory adaptation (zoning out the TV, etc...) 22. How do electronic speakers work 23. How do sonic booms work/sound barrier breaking 24. How much noise can the human ear withstand before is explodes 25. How is perfect pitch possible 26. Why are some people tone deaf - Zach :( 27. How does echo location work 28. ear popping 29: what happens when sound hits something

Notes from class/What we have learned so far
4/1 Harmonics - Nodes and Antinode, where the vibrations goes. - Relationship between frequency and wavelength Frequency is inverse proportional to wave length Frequency is proportional to the wave velocity F = V / Lambda -The type of harmonic depends on open and closed ends. Conditions needed by close and open = boundary conditions boundary conditions could be node or antinode, depends if its closed or not / vibration Nodes to antinodes = quarter wave. each harmonic you go up is a node and an antinode increase # of waves by half a wave length - The higher the particle displacement the lower the pressure

3/21 handed out blue sheet looked at some bart hopkins videos, not all looked at instrument types guitar tuning nodes, harmonics, overtones

3/19 HW: Read 11.7-11.8 Do: Q 16,17, P 29-31, 34 link to problems from honors book: http://ronnebergscience.com/physics/documents/waves_sound/ch11%20probs.pdf

1: The higher the tension the higher the pitch. - Bigger is lower - smaller is higher. 2: the smaller of the volume and density equals higher, unless tension overrides it. ie. stretching rubber bands then vibrating them 3: the more water, the lower the pitch it gets. - Less vibration when water is added. - the walls of the glass vibrates - water changes the speed of the vibrations. 4: vibrations create sounds - depends on the speed of the vibration 5: materials/tension/size/mass might affect the speed of the vibration 6: sound can travel in water - moves the water molecules instead of the air molecules 7: Mr. Ronneberg needs to learn how to play the guitar.

superposition: when 2 waves meet they add or negate eachother wave speed is related to tension, and mass wave speed is not affected by amplitude, frequency, wavelength 3/18 wavelength - length from one point on a wave to the same point on the next one frequency - waves per time amplitude - height from center to crest period - time needed for 1 wave wave speed - how fast the wave is traveling tomorrow: what are wave, diff freq, hearing range, effect speed. 3/17 Replace this text with all the interesting things we discussed

Who is building what
This is a list of who is building what, so if you are building something similar, you can discuss ideas or problems with them

Stringed Instruments
Andrew S. -a solid body electric guitar Adam S- a 1337 guitar