Rainbows and Human Eye (in library on 5/2/11)

Today I would like you to investigate how a rainbow is formed and how the human eye sees things, including how nearsightedness and farsightedness are corrected.  These concepts correspond to questions 12 and 14 on your 14+15 Review Sheet.  Both of these concepts will be short answer questions on your test on Thursday.

Instructions for Rainbows:
1.  Go to The Physics Classroom Link (bottom one)
2.  Go to Physics Tutorial
3.  Go to Refraction and Ray Model of Light (last one I think)
4.  Go to Lesson 4 and pick Rainbow Formation

Focus on the diagrams for how a rainbow is formed.  What 2 things happen to the light waves?  (think about the wave properties we have discussed).  Draw a picture of what happens in the water droplet.  If blue comes out on top of the droplet, why is it that red is on top of the rainbow that we see?  What 3 requirements are needed to see a rainbow?  (this is in the very last sentence of the rainbow section)

Instructions for The Eye:
5.  Follow previous instructions in Physics Classroom, but go to Lesson 6 (The Eye)
6.  Read about Anatomy (a), and Image formation (b)
7.  Read about farsightedness and correction (d)
8.  And nearsightedness (e)

Check out the eye diagram and how the human eye works.  How does the lens help focus to near and far?  What is wrong with a person's eye if they are farsighted and how is it corrected?  What is wrong with a person's eye if they are nearsighted and how is it corrected?

The Week of 5/2-5/6

• Monday 5/2:  Go to library.  Check off Lens HW and go over.  Look up rainbows and nearsightedness and farsightedness (instructions/questions will be on this blog).  Then do project research and/or LoggerPro graph for Snell's Law Lab. 
• Tuesday 5/3:  Turn in Snell's Law Lab.  Check off Critical Angle HW and go over.  Go over 14+15 Review Sheet. 
• Thursday 5/5:  Turn in 14+15 Review.  Take 14+15 Test.  When finished read 17.1 (pp 628-633).  Basic static electrics vocab.
• Friday 5/6:  Coulomb's Law.   HW p. 636 1-4. 

Due Date for the Physics on the Edge Project is Thursday 5/26.  Presentations will begin that day and go until we finish. 

Snell's Law Write-Up, Due Tuesday 5/3

1.

1. State Purpose 
2. Background 
3. Neat, labeled data table for both parts 
4. Turn in Tracings with names on it
5. Graph that has 2 lines on it 
6. Calculate index of refraction for each material 
7. Calculate Percent Error for Water
8. Conclusion (described on hand-out)

The Week of 4/25-4/29

• Monday 4/25:  Check off HW p. 540 1-6 (do 2 ray diagrams).  Refraction of Light.  Index of Refraction and Snell's Law.  HW p. 567 1-3.
• Tuesday 4/26:  Check off p. 567 HW and go over.  Snell's Law Lab.  Write up due next Tuesday 5/3.
• Thursday 4/28:  Ray Diagrams and Lenses.  HW p. 576 1-4.  Go to library for Project Research.  Try to firm up your topic this week!  (Project will be due 5/26).
• Friday 4/29:  Check off Lens HW.  Critical Angles and Total Internal Reflection.  HW p. 582 1-4.  Hand out Review Sheet for Chapters 14+15.  Test next Block Day.

The Week of 4/18-4/22

Your musical instruments were amazing! 

• Monday 4/18:  Continue with the Mirror Lab.  Do the 2 mirror part.  Turn in with line tracings when finished.
• Tuesday 4/19:  Mirrors and Image locations using ray diagrams.  HW, p 536 1-4.
• Thursday 4/21:  Convex mirrors and colors.  HW p. 540 1-6.   Hand out 4th Quarter Project. 
• Friday 4/22:   Refraction of Light.  Read 15.1.

The Week of 4/11-4/15 and Answers to Review Sheet

I have just completed entering quarter grades into EdBox.  This will be the grade you receive unless you see a problem and contact me.   This week we have a 12+13 Test on Tuesday and the Musical Instrument due on Thursday.

• Monday 4/11:  Go over 12+13 Review and the concepts that will be on the test.  Hand out 4th Quarter "Deal" and explain. 
• Tuesday 4/12:  Turn in 12+13 Review.  Take 12+13 Test.  Questions on Musical Instrument?
• Thursday 4/14:   Show off Musical Instruments.  Play a song or a piece of music for extra credit.  Turn in instrument write-up (see documents section if you forgot what you need).  Introduce Electromagnetic Waves and the Electromagnetic Spectrum.  Is Light a Wave or a Particle?  Read 14.1.  Start Mirror Lab?
• Friday 4/15:  Reflection.  Mirror Lab.  Read 14.2.

Answers to 12+13 Review: 
1.  -500 N/m       2.  4.0 Hz       3.  4.07 s          4.  17.5 m/s2    5.  105 complete osc.
6.  0.0055 m        7.  4 nodes      8.  1/9             9.  0.25 W         10.  180Hz,540Hz,900Hz
11.  100 dB         12.  0.20 s       13.  70.1 Hz      14.  3000 Hz (2 sig figs)    15.  4 Hz

The Week of 4/4-4/8

The Late Work/Extra Credit Deadline for 3rd Quarter is Tuesday 4/5 by 1:45.  Remember that this is a strange week, with Block Days falling on Tuesday and Thursday.

• Monday 4/4:  Check off HW #2 p. 188 1-5 and go over.  Harmonics on a string and on an open or closed pipe.  Harmonics Equations.  HW #3, p 199 1-4.
• Wednesday 4/6 (short classes):  Check off HW #3 and go over.  Hand out Chapters 12+13 Review.  The test will be next Tuesday 4/12.
• Thursday 4/7:  Speed of Sound Lab.  Take data and do calculations.  Short write-up due by next Monday. 
• Friday 4/8:  Teacher Work Day.  No School.

Remember that your Musical Instrument Project is due next Thursday 4/14.  Look in the documents section for instructions if you lost yours.