Homework on Conductors

Discuss the issues and solutions in your book

Paste this in your Prac Book.

Gather information and report the sources

Process the information in a identification Table

Warning: Copper was used when it was it was cheap, now Lines use another element!

Prac Assessment

In groups you are to plan, experiment and report a prac that covers the following "Students Do" points


Write an Aim, Propose a circuit with a two resistors, various voltmeters and ammeters.
Build and test the circuit, demonstrating these points.

Leave a space in your prac books to paste these points in.

Revision links
Basic circuits
Voltage
Series and Parrallel

Galvani and Volta

refraction in the pool

More on rainbows

It may come as a shock the purple hue at the bottom of the rain bow, is not the bluest light that has been bent at the largest amount, but a superposition of a "Supernumerary" rainbow. The darker blue at the short wavelenght is being mixed with the red of the next rain bow. I have not been able to model this effect. The supernumeray rainbows are seen when the rain drop size are close to Mie white cloud scattering.

Here is another picture which to the untrained eye looks as if the last colour of the rainbow is purple, but you can see it is very light green.

If you put sunlight through a prism you get the pictures below

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