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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 | |||
So what's inside a television
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You need to smash it to find out. MyYoutube 2:30 |
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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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The term electron was coined by an Irishman called George Stoney. See the original paper here |
Stoney is obviously staking his claim on being the first to use this term, but
is aware that Professor von Helmholtz is also in the running for the accolade. Note also the reference made to ether, something which we now tend to convieniently forget about. |
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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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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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Absorption
and Emission Applets |
Nice n' Easy simulation. Energy comes in and bumps electron up to various levels. Can be downloaded
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4 Star |
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Note that the energy level to which the electron rises depends upon the wavelength (or frequency) of the incident photon |
4 Star |
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Absorption and Emission spectrums for all elements |
Click on each element to see its unique spectrum (its 'barcode'). |
4 Star |
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| Beautiful pictures of emission spectrums on flickr | Taken with a camera and a hand-held spectroscope. |
4 Star |
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How Kirchoff first discovered Spectroscopy |
From HowStuffWorks. 3 minutes |
4 Star |
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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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| Penetration of x-rays | From explorelearning.com | 4 star | |
Xray images of Sword Swallowers in action |
Freaky |
4 Star |
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Short Video |
Youtube 20 secs |
3 Star |
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Whatever became of X-rays? |
Interactive site covering modern medical imaging |
3 Star |
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Sticky tape x rays |
I Youtube. 30 seconds |
5 Star |