Posts Tagged ‘light’

Refraction

Friday, April 29th, 2011

refraction by the_green_squirrel

All waves refract.  This means that they change speed as they travel from one medium to another.  For example, light waves travel faster in air than they do in water.  This means the pencil in the glass of water looks like the picture on the right.  For a full explanation of refraction, read this.  Hopefully you now understand the concept.  If not, ask this archer fish to explain it to you!

We will do a lab to investigate refraction of light as it passes through glass and perspex, and to determine the refractive indices of these substances.  This handout (thank you Mr Duckworth) explains in more detail. Grade-9-Integrated-Science-Waves-Topic-refraction1

You will be required to submit the data tables, calculations and graphs for this lab only.  Refer to this rubric: FINALRubric DCP

Photosynthesis

Friday, February 18th, 2011

Jatropha hybdrid - leaf detail by tonrulkens on flickr

And here is the sing-along song for this topic.

For notes on the SL portion of the syllabus, here is a useful powerpoint.  Photosynthesis  This is the core material from our favourite teacher in Indonesia.  Once you have grasped the basics, move on to this HL stuff.

We’ll cover a lot of interesting ideas in this unit.  How are plants affected by light of different wavelengths?  What is the relationship between structure and function in chloroplasts? What is meant by limiting factors in determining photosynthetic rate?  How can we measure photosynthesis?  And, of course, we’ll delve into the biochemical pathways of the light dependent and light independent reactions.

Useful video for labs.

There are 3 online photosynthesis simulations that we will use.  This first one is nice and simple and should help get you started on your design lab.  This one is also easy to use.  This third one is more complicated, and you might want to come back to it as we go through the topic.

Lenses glogs

Thursday, May 20th, 2010

Canon FL 55mm f1.2 by Arkku on flickr

You can check out each other’s work by clicking on the links below.  You can learn from each other!  Feel free to give each other feedback by leaving a comment.

  • Sam                                 Grace
  • Karenina                       Daniel
  • Justin                             Tyler
  • Mumba                          Carlo
  • Danilo                             Hiram
  • David                              Timmy
  • Anushay                        Kevin
  • JP                                     Davis
  • Adrian                            Ethan
  • John                                Stefan
  • Sandy                              William
  • Bianca                             Agustin
  • Trix                                  Ines
  • Sera                                  Gaby
  • Gabby                             Juliana
  • Nish                                 Emily

Reflection

Tuesday, May 18th, 2010

car side mirror reflection by just_a_name_thingie on flickr

You are going to investigate reflection in a plane (flat) mirror.  You will use the apparatus provided to collect data to support your findings.  You will be required to present the data in tables, and then to process it appropriately.  Make sure you look at the previous lab on refraction, and don’t make the same mistakes! 

Here is an outline from Mr. Duckworth that explains in a bit more detail what you need to hand in.  REFLECTION LAB

Application of lenses

Thursday, May 13th, 2010

telescope by Waifer X on flickr

Here are links to a couple of sites on ray diagrams.  This first one is factual.  This one is interactive, and covers the different types of image obtained when you place your object various distances from the the lens. 

Make sure you know the difference between a real and virtual image, an inverted and an upright image, and a magnified and diminished image.

Now that you know all about refraction, and how light bends as it passes through lenses, it’s time to take a look at where we use lenses in our daily (or not so daily) lives.  Microscopes, telescopes, cameras, binoculars, all contain at least one lens.  Your task is to select one application of lenses and do some research on it.  Prepare a glogster poster of your findings.  You must explain what type or types of lenses are present, what refraction has to do with your chosen application, and how it works.  Follow the links here to help get you started.

Eye see

Thursday, April 8th, 2010

We’ll take a look (ha ha) at the structure of the eye, and learn how it captures light waves so that we can see.  Eye-diagram  We’ll be able to identify the parts by name and also explain their function.  We’ll understand how the eye is like a camera, and we’ll do an eye dissection.