Student+Work

This is some of the Student work that has come in recently This is from one of my PH100 Students 2/6/09 for the Refraction Practical on-line in Blackboard/PH100?Waves

I started by cutting out a piece of cardboard and ruling a line in pencil on the part of the cardboard that was going to be inside the bowl and then drew in the "normal" line and a line at a 30 degree angle to the vertical. I then looked obliquely across the card and drew in a line that I perceived to be in line with the one underwater. I took the card out, dried it, and repeated the process with different angles, such as, 0degrees, 10 degrees, 20degrees, 40 degrees and 50degrees.
 * Refraction Experiment Level 2 Physics**

There were a couple of problems that arose, that I believe could cause inaccuracies in the results. For one, we used brown cardboard. Although the pencil was dark, when the cardboard got wet, it also darkened, which made it increasingly hard to see the line under the water. Also, the oblique angle that I looked from, made it difficult, not only to see the line, but to draw the line in as well.

From my personal results, no this is not an exactly direct relationship. However, because of the possible problems that I mentioned previously, there may have been some minor inaccuracies in my results.

Tish - my feedback. I would give her an Achieved even though there is no graph

**from about SC1032 level 0ne "everyday Waves"**
Hi Tish i am currently working on the assessment for standard AS90952 (Investigate implications of wave behavior for everyday life). And i am quite unsure as to what i am meant to do. Does my report have to contain two viewpoints, positions, perspectives, arguments, explanations AND opinions? If so, could you please give an example for each of these please as i'm not sure what they would look like. Also, what are the key scientific theories? And lastly, could i see some exemplars? If you could help me out with these, i would appreciate it.

Thanks, Hi It is two viewpoints, positions, perspectives, arguments, explanations OR opinions Key scientific ideas are:- What s part of earth’s crust causes earthquakes How do they happen, that is what is the actual event which causes the earthquake to happen What terms are associated with this event What are the types of earthquake waves and how (and where) does each kind travel

The main example is the ‘Cairo Earthquake’ report which is in the book Hope this helps

Tish

**Subject: Nuclear fission reactors**

PH2052 Pg 34 on nuclear fission reactors gives a summary on coolants. Materials used are mentioned. But the diagram mentions 'helium coolant' which is not mentioned in the notes. Can you please clarify as this is confusing.

Are the graphite reactor core and reflector, shown in the daigram, part of teh moderator? May31 2012

It's a long time now since I was around a Nuclear Power plant – incidentally the first one, Calder Hall. I hadn’t picked up the bit about ‘helium coolant’ in the book. But because helium is a very un-reactive element and can be very cold even in the gas form. So using it as a coolant even in the gas form is possible and it has been used as such in gas-cooled reactors in the United States. It is not a common kind of reactor (most are water cooled or sodium cooled) and definitely not a common use of helium

Yes, the graphite core and reflector in the diagram //are// part of the moderator  Tish 