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twilight last won the day on March 17 2014

twilight had the most liked content!

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    Nov 2013

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  1. I think each school has a different order for teaching. For my school, in the first year of IB we learned atomic structure, periodicity, bonding, energetics, kinetics and equilibrium. I think atomic structure and bonding are really important as they sort of set the foundation for the rest of the chapters. But none of them are too difficult topics actually.
  2. twilight

    Choosing an EE subject

    I did my EE in Physics. I think to do an EE in any of the sciences, you need to love lab work a lot because you have to design your experiments from scratch, which means lots of failures before you actually can conduct an experiment that allows you to collect data. Which also means that you need to be prepared to spend a lot of time in the lab. Some people say like for an English EE you just need to read the book and it's possible to write it in 2 weeks at home (sorry, not deriding or looking down on English EE, just brought it up as a contrast) but if you want to do well in a science EE, you really need to spend quite a lot of time. The work doesn't stop at collecting data though because it is also possible that the data you collected is totally unexpected. And then you have to conduct the experiment again to check that it is not an error, and then sit down and comb through hundreds of journals, wondering why you got an unexpected result. These are of course scenarios in case you decide to do a topic that is not very conventional. If you pick up conventional slightly modified textbook experiments, your work probably does not amount to as much.
  3. I did not explicitly state my KQ (is that what they call KI in the new syllabus? Sorry I'm not too up to date) as a form of a question in my essay. It's probably due to the nature of the title I was answering. My title showed 2 sides of an issue, so in my introduction I just wrote something along the lines of agreeing with the statement, and then another sentence of however it is questionable if that is true. So I suppose this is another way one can write it if framing it as a question becomes jarring to the overall flow of your essay. You should make clear your main knowledge question (whether in the form of a question or a statement) but don't really need to explicitly state all your sub knowledge questions. 1600 words is really not a lot. If you are doing the essay properly (in a TOK manner), sub knowledge questions surface naturally along the course of your essay and examiners can see that your essay is answering any questions that surfaced, whether or not you stated the questions explicitly or not.
  4. twilight

    Physics EE Help

    As I just said in another post, doing an EE related to aerodynamics is very very difficult to score well in due to the difficulty of controlling variables, which is backed by countless subject reports which you can ask your teacher to show you.
  5. twilight

    Physics EE - Wind turbines and power generation

    I initially planned to do an EE on wind turbine as well but my teacher highly discouraged me from doing it because it deals with aerodynamics which is very difficult to control (controlling of variables is one key aspect of doing well in EE). It is also mentioned in the subject report year after year that aerodynamics is a very difficult field and students who venture into it don't usually score well. I am very interested in the field of energy and ended up doing an EE on solar cell. Experiment was very simple and variables controllable.
  6. twilight

    ToK Presentation Help

    Well the areas themselves are ok, but without knowing what exactly you want to do, it's a bit difficult to say whether they're fine. I think 3 AOK is rather a lot, I'm not sure if you can cover them in enough depth in 10 minutes. For the WOK, let them come naturally. As you prepare your presentation, I think you will find that you are able to bring in other WOK. If there is no need, 2 WOK is actually enough. Don't force it.
  7. twilight

    Ib chemistry ia 36/48

    I think it's a 6. IA is 24%, so you have 18%. My teacher always told us 20% and above is safe, so I assume 20% and above is a 7.
  8. It depends on the school whether you can check the marks of your subjects online though. My school made the setting in such a way that all we could see was the numerical grades for each subject. To get further information, we had to ask our IBC.
  9. twilight

    ToK Presentation Help

    Well what exactly do you want to do with those?
  10. I typed oil spill affect photosynthesis. I did it in regular google search. I don't use google scholar. Yes qualitative comparison is enough, that is if your experiment shows that the thicker the layer of oil (or whatever), the lower the photosynthesis rate, you just need to find one journal that also shows that the thicker the layer of oil (or whatever), the lower the photosynthesis rate. You don't need to find one where the data of the journal matches your numbers. It is almost impossible to exactly replicate the experiment conducted in the journal.
  11. twilight

    Physics Extended Essay

    What's an accelerating unit? As long as your investigation has a practical purpose, is doable with all the equipment you have, the variables can be controlled well, does not involve complicated math and can be written in full detail in 4000 words, it's usually fine.
  12. I can't believe you can't find any. I found plenty on just the 2nd page of google. You don't need to have an article that is exactly the same as your experiment. You don't necessarily have to find one which matches your data, just qualitative comparison is enough.
  13. twilight

    Help with the Functions Unit

    For M11 TZ2, 1. Everywhere where y=0 on the y=f(x) graph, when you take the reciprocal, it becomes 1/0 which approaches infinity, so at x=0 and x=2, you have vertical asymptotes. 2. On the y=f(x) graph, there is horizontal asymptote at y=2. When you take the reciprocal, the horizontal asymptote becomes 1/2. On the y=f(x) graph, y approaches 2 as x approaches negative infinity. Therefore, when you take the reciprocal, y will approach 1/2 as x approaches negative infinity. As x approaches positive infinity 1/y will approach 0. I suppose you know how to get the other parts, like minimum becomes maximum etc. For 5b, you have to do it 'manually'. So you first find the points which are easy to find, which are basically at x=0 and x=2 because you know that when x=0, f(x)=0, so y=0. At x=2, f(2)=0, so y=0. To find how the graph looks like on the other parts, substitute values. Let's say in the original graph when x=1, f(1)=-1. You don't know that this is the case, but it doesn't matter because you just need the shape of the graph. And then you see what happens when x=-2 or any other negative number, it doesn't matter, and also when x=3 or any other positive number. For M10 TZ1, 1. Find the vertical asymptotes for the reciprocal graph. You see on the original graph that x=-2 is a vertical asymptote. But with the reciprocal graph, you know x=-2 gives you a valid solution. 2. Find the horizontal asymptote. Since it's a modulus function, just reflect the part below the x-axis to the positive side. For N10, You need to do this manually, similar to the M11 question. So you first find the 'critical' points (this is what I call them) where f(x)=0 and g(x)=0. When f(x)=0, you know the f/g will be 0. When g(x)=0, f/0 will be undefined so you know that will be a vertical asymptote. When f(x)=g(x), f/g will be 1. And then you find the remaining points by substituting certain values, and then you can sketch the graph from there. Sorry if this is not clear, I'm not exactly sure how much you know/ don't know. Feel free to ask if there's some more you're not clear about.
  14. I did the November session, so late March would be equivalent to my late September. At that time, we were having mock exams. For about 2 weeks. The last 2 weeks of September I think. In early October, we got back our papers and the teachers went through them. After that, it was basically self studying in school. I didn't have homework. It was up to us what we wanted to do. But since here entry to university is dependent on our final IB grades, my classmates were all very motivated to study. Some of them just slacked off in school though because they say they can't study in school. So yeah for me, we did nothing during that period leading up to the final IB exams as well. Teachers did not do anything much either, and certainly no homework.
  15. twilight

    Physics Extended Essay

    My RQ was 'what is the relationship between temperature fluctuation a solar cell is subjected to and its change in energy conversion efficiency', something along those lines. You can search through ISEF database for ideas, or look at the tasks for young physicist tournament.

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