Dr Hill Discusses Rainbows

Rainbows occur when sunlight is refracted as it enters, totally internally reflects and finally leaves water drops suspended in clouds.

The water drops have to larger than normal cloud droplets. Light from the background comes straight to you with out being scattered as it would be for fog or a cloud.

There are different colours because the red light travels faster through water, is refracted less and is at the top of the rainbow. Blue slows more and is bent further.

Because rainbows are reflected light you can enhance them with polaroid sunnies or completely turn them off by turning your sunnies through 90 degrees.

As you can see in the first photo there is a second more dispursed rainbow as the light takes a trip throught the rainbow.

You can also see repeated rainbows ans general cloudiness beneath the rainbow.

Sickest song I have heard in a while

Homework Register

14. Start of Term 3 - Holiday Homework

13. 8/7/09 Chapter 6 Questions 26 - 32. to be worked through in class - email questions you want worked through

12. 6/7/09 Page 117 questions 4 to 16 in Jacaranda Preliminary Course Physics

11. 2/7/09 Getting Electricity into the Home

10. 29/6/9 Prac assignment - Prelim work

9. 25/6/9 Complete writting the Galvani and Volta Debate - Dates- What they thought, what was the real answer. What does this say about the history of science.

8. 25/6/9 Complete Topic Test on The World Communicates

1. Page 26 Q 14 , 15 Superposition of waves
2. Write the speeds of sound for in air, water and vacuum, the speed of light
3. What is the wavelength of 330 Hz sound
4. Summarize the properties of IR, Vis, UV, Xrays, Gamma Link
5. Question 13 Page 42
6. Summarize Chapter 4 (8/6/09)
7. Work Sheet on Motion (9/6/09)

Year 11 Homework

Please do question 14 and 15 from page 26

Exam Notification

Physics Exam 11.25 and 12.30 Moday 25 May
Homework For monday Upload a file of EM penetration.

2008 Exam will be handed in Tuesday, Scanned and corrected.

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Homework

Upload on Moodle and Excel plot of data you have gathered about the different levels Radiation Penetrates in the atmosphere.

Log on to Moodle by going to EBHigh.com or links at the bottom of this page.

Superpostion of waves

Superposition of traveling waves means

1) Take two waves to superimpose

2) Move them to a particular time

3) Add the two together

-if both ++ they build high

-if one is zero adding is easy

-if +=- then adds to zero

Homework

Due Fri - The multiple choice from 2004 midyear

Due Monday 4 Wave graphing handout.

Holiday Homework

Summarize Chapter 1
All questions on Page 10 and 11
Summarize Chapter 2
All question on Page 25 -26

Transverse Waves-1

Reflection and Refraction of Light Waves (Huygens' Principle)

Math, Physics, and Engineering Applets

PhET Wave Interference - Electric field, Interference, Diffraction ...

Video of world's biggest wave