Monday, Nov 22, 2010

Review for test

Went over RA 11.2b
Answered any questions
Handed out Final Vocab Quiz (all questions)
Went over Final Vocab Quiz

Gave students 3 minutes to list every demo and lab, no matter how big or small, we did about waves. Asked how many students had 10 or more, 8 or more, 5 or more, at least 2.

Went around the room asking for the demos and labs and then what the main idea behind it was.
1. Slinky lab - create transverse and longitudinal waves, show the relationships between energy, frequency, and wavelength, show standing waves with nodes and antinodes.
2. Oscilloscope lab with frequency generator - show that high pitch waves have high frequency and short wavelengths
3. Oscilloscope lab with microphone - students talk or whistle into microphone. See "voice prints". Again see that high frequency and high pitch sounds have short wavelengths
4. Singing rods - the shorter rods created shorter wavelength, higher pitched sounds
5. Gong Grates - sound travels at different speeds in different materials
6. Thunder Tube - Speed of sound. You see a flash of lightning and then count the seconds until you hear the thunder. 5 seconds for every mile away.
7. People waves - show difference between transverse and longitudinal waves
8. Student leaves room - diffraction - you can hear around corners but not see around corners because the longer wavelength sound waves are bent (diffracted) more
9. Pencil in water - refraction - light is bent when it goes from one medium into another due to differences in wave speed.
10. Mirror - reflection - angle of incoming wave = angle of outgoing wave
11. Belly dancing tuning fork - waves are caused by vibrations. A wave is a wiggle that moves through space. Also see nodes and antinodes.
12. Straw Duck Calls - longer straws create longer wavelengths and lower pitch
13. Pull-a-tune - the longer bars created longer wavelength, lower pitched sounds
14. Picket fence and telephone cord - only transverse waves can be polarized
15. Polarization of protractors, plastic fork - polarization can be used for stress analysis
16. Milk powder in aquarium - why the sky is blue and sunsets red, scattered light is polarized

Quia Review

Demos for Waves
1. Pull-a-Tune: wavelength and frequency
2. Picket Fence: Polarization
3. Singing Rod: wavelength and frequency
4. Slinky: types of waves, wavelength and frequency
5. Oscilloscope: wavelength and frequency
6. Pop Bottle: wavelength and frequency
7. Corn Syrup: polarization
8. Radio picking up TV signal: electromagnetic spectrum
9. Straw Duck Call: wavelength and frequency
10. LCD goes bright to dark: Polarization
11. Powdered milk in water: scattering/polarization
12. Maritza left room: diffraction
13. Microwave soap and CD: electromagnetic spectrum, just fun
14. Gong Grates: speed of sound in different materials
15. Belly Dancing Tuning Fork: waves are wiggles
16. Why sky is blue, sunsets red: scattering
17. Pen in cup of water: refraction
18. Rainbow glasses: diffraction
19. Black Hole: just for fun
20. Mirages and Fermat's Principle of Least Time: refraction
21. People Waves: Type of waves
22. Mirror: reflection
23. Thunder and Lightning: speed of light and speed of sound
24. Plastic on overhead: polarization
25. Echoes: reflection