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Ask Jeeves for Kids!

an excellent search engine you type a question and Ask Jeeves comes up with either the solution or a series of similar questions with answers.

http://www.ajkids.com/

Refraction and the Ray Model of Light

Useful information driven site which provides details on how light is refracted (including total internal reflection).

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http://www.physicsclassroom.com/Class/refrn/

Refraction, Snell's law and total internal reflection

A concise but detailed explanation of refraction. Clear diagrams and worked examples, some harder than others.

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http://buphy.bu.edu/py106/notes/Refraction.html

Ion drives: Science fiction or science fact?

A discussion of the possibility of ion engines and how they would work.

http://www.esa.int/export/SPECIALS/SMART-1/SEM3JQXO4HD_0.html

Snell's Law

Applet showing refraction of light from medium 1 to medium 2. refractive indices and incident angle can be altered, and total internal reflection demonstrated.

http://stwww.weizmann.ac.il/Lasers/laserweb/Java/Twoangles2.htm

Refraction and total internal reflection

Applet in two parts - the first a fish's view from under water. In the second the position of the cursor is the source of a light ray. Its path from within the water to an observer appears.

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http://www.phy.ntnu.edu.tw/oldjava/optics/path_e.html

Adiabatic Process

An adiabatic process is one in which no heat is gained or lost by the system. The first law of thermodynamics with Q=0 shows that all the change in internal energy is in the form of work done.

http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/adiab.html

Wolfram Alpha

Wolfram|Alpha is more than a search engine. Use it to find facts and formulae, perform calculations, plot graphs, get info about space probes and much more.