Science Experiments

Archive for November, 2008

Question: how to create a radio frequency transmitter?

For my science experiment i need a radio-wave frequency generator/transmitter. I was hoping someone could give me some tips on how to create one.
preferably a powerful generator with a wide range of frequencies and if possible a way to control which frequency. But anything would be great. If you can, could you please tell me where you learned this.

Answer: If you have a science experiment to build but no knowledge of how to make a radio-transmitter for it, I would suggest you buy one. Not only will that save you enormous amounts of headaches but it will also let you get back to your science experiment faster.

There are enormous differences in techniques to build transmitters depending on power, frequency range, linearity requirements, pulse/continuous operation requirements, load impedance etc..

I could give you a few ideas if you specify what it is that you are trying to do (not just the frequency and the power, please).

But if it happens to be in a non-trivial phase-space of the power rf world, you will curse the day you ever thought of building something yourself before you ever get to do your experiment.

You will learn these things by building power transmitters. Especially the cursing part.

Hamster Lego electric generator science project

Question: Help needed in the field of science?

this is my science project: can air pressure alone force an egg to be pushed inside a bottle? here is where my problem is- it needs to be a controlled experiment! any ideas? (and it has to be at an eighth grade level, not too hard but not too easy as in I didn’t try).. if i can’t make this a controlled experiment, are there any other experiments I can do? Please answer ASAP! Greatly appreciated!
i know how to do the project and all, I just need to compare it with something–> it needs to be a controlled experiment and not just a demonstration
PLEASE ANSWER!! I need help

Answer: yes this can be done you need a glass milk bottle one candle and a boiled egg.1 boil egg let it cool then peel egg 2.place candle in bottle using blue tac.3.once you get the candle in the bottle light candle place peeled egg on top when the the flame of the candle burns up all the oxygen in the bottle.it then will create a vacuum pulling the egg into the bottle.

Simple Air Pressure Experiment

Question: Help with the 6 steps to a Scientific Method!?

I have a Science test tomorrow and I need to learn the 6 Scientific Method steps and briefly explain each one. So I’m just making some notes but I still need to explain the steps. Plzzz help! Thanks soo much if you do!

~6 Steps~
1. Ask a question
2. Do background research
3. Form a hypothesis
4. Form an experiment
5. Analyze the results
6. Restate Results

Answer: I just googled it and found this:

Steps of the Scientific Method Detailed Help for Each Step
Ask a Question: The Scientific Method starts when you ask a question about something that you observe: How, What, When, Who, Which, Why, or Where?

And, in order for the Scientific Method to answer the question it must be about something that you can measure, preferably with a number.

Do Background Research: Rather than starting from scratch in putting together a plan for answering your question, you want to be a savvy scientist using library and Internet research to help you find the best way to do things and insure that you don’t repeat mistakes from the past.

Construct a Hypothesis: A hypothesis is an educated guess about how things work:
“If _____[I do this] _____, then _____[this]_____ will happen.”
You must state your hypothesis in a way that you can easily measure, and of course, your hypothesis should be constructed in a way to help you answer your original question.

Test Your Hypothesis by Doing an Experiment: Your experiment tests whether your hypothesis is true or false. It is important for your experiment to be a fair test. You conduct a fair test by making sure that you change only one factor at a time while keeping all other conditions the same.
You should also repeat your experiments several times to make sure that the first results weren’t just an accident.

Analyze Your Data and Draw a Conclusion: Once your experiment is complete, you collect your measurements and analyze them to see if your hypothesis is true or false.
Scientists often find that their hypothesis was false, and in such cases they will construct a new hypothesis starting the entire process of the Scientific Method over again. Even if they find that their hypothesis was true, they may want to test it again in a new way.

Communicate Your Results: To complete your science fair project you will communicate your results to others in a final report and/or a display board. Professional scientists do almost exactly the same thing by publishing their final report in a scientific journal or by presenting their results on a poster at a scientific meeting.

Tea Bag Rockets – Cool Science Experiment