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The Electron
Quantum Theory links |
What has Quantum Theory got to do with The Electron? It seems that the electron can be proven to be a wave rather than a particle. Why is this crazy stuff not on the syllabus? |
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Discovery of the electron by J.J. Thompson
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Youtube 3 minutes. Thompson won a Nobel prize for discovering the particle called the electron while his son later went on to win the Nobel Prize for proving it was a wave! |
4 Star |
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| Cathode Ray Tube | |||
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How a CRT works
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Description of how a Cathode Ray Tube works. Youtube 6:30 |
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How a television screen works |
Very nice introduction |
4 Star |
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Want to know what's inside a TV? –Try shooting
it. |
Not quite the scientific approach, but whatever rocks your boat. Obviously American. From howstuffworks.com |
5 Star |
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What happens when you bring a strong magnet up to a tv screen? |
Youtube. 4 minutes |
4 Star |
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Something similar |
Youtube. 1:30 |
4 Star |
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| Applets
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Basic Cathode Ray Tube applet, increase the voltage to attract the electrons |
3 Star |
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Deflection of charges in an E-Field |
3 Star |
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View J.J. Thompson's letter where he described
his experiments on cathode rays |
Heavy going indeed |
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A beam of electrons moving at right angles to a magnetic
field will move in a circular path |
What it says is what it does |
4 Star |
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Why a charged particle moves in a circle |
Nice animation to help explain the concept. Youtube. 15 seconds. |
4 Star |
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Photoelectric Effect Applets |
Shine the light (once it's at the correct frequency) and watch as electrons get released. |
5 Star |
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From explorelearning.com, another very useful applet |
5 Star |
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Simple animation but effective in demonstrating various aspects. |
5 Star |
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Simple animation to illustration the maths equation. |
5 Star |
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| Nice home-made demonstration. YouTube. 1 min | 4 Star | ||
The Photoelectric Effect |
Using simularion plus demonstration . MyYoutube. 9 minutes. |
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The Photoelectric Cell |
Using simularion plus demonstration . MyYoutube. 5:30. |
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X-Rays |
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| Diagram of an x-ray tube | From explorelearning.com | 4 star | |
7 minute introduction from Youtube
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4 Star
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Short interactive introduction |
3 Star |
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X-ray images |
Drag the viewing frame around the palm of the hand to see its x-ray image |
4 Star |
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Lots more x-ray images |
4 Star |
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| See also the clips in the "Light Waves" page | |||
| Penetration of x-rays | From explorelearning.com | 4 star | |
Xray images of Sword Swallowers in action |
Freaky |
4 Star |
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Sticky tape x rays |
I Youtube. 30 seconds |
5 Star |