I need to start a physics project over summer, something of an A-Level standard or higher. I want to do something practical like an experiment and then write about 5000 words on it. My budget is between £100 and £200 (≈$200 to $400) and I must have the entire project finished by March 2012 so I have a long time to do it and it can be quite in depth. I want something that will be a challenge and will really impress a university admissions tutor. I'm stuck for ideas so far, everything I think of is either far too complicated/expensive or the complete opposite so all suggestions are welcome. Thanks.