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Light Waves
Interference |
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Young’s Slits Applets
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Simple Introduction . Play with the variables after first predicting what will happen.
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4 Star |
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Rotate the view on top and play with the variables on the bottom
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5 Star |
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nlamda = d Sin theta Applets
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Nice presentation of the significance of the diffracted angle, theta.
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5 Star |
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Ideal to demonstrate Path Difference
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5 Star |
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Petrol film and Soap Bubbles
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Takes a bit of work to figure out what's happening - read the instructions |
4 Star |
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A more basic simulation, but you can change the thickness of the bubble |
3 Star |
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Series of pictures set to music. One minute from YouTube |
4 Star |
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Colour and Wavelength
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Notice that when wavelength changes so does frequency. |
4 Star |
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Notice also the effect of slit-width on diffration. |
4 Star |
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Polarisation |
Nice for demonstrating the unpolarised wave |
4 Star |
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You can insert and remove the polarisers, and rotate them |
4 Star |
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Putting the polariser over the sun has no effect, but puting it over the water and rotating it does. |
4 Star |
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You can rotate the polarizers |
3 Star |
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Colour Mixing
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Drag the coloured squares over each other |
3 Star |
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Try the following head-wrecking exercise, called the 'Stroop'
effect. From Youtube. One minute |
4 Star |
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Mr Devitt demonstrates colour mixing for the stage. MyYoutube. 10 minutes |
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Dispersion
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Dispersion of light by prism
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Play with the different filters |
3 Star |
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And by a Water Sprinkler
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Youtube. 2 minutes. I think this is why they say a little knowledge is a dangerous thing. |
5 Star |
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Dispersion in rainbows |
Slow-moving animation, but useful. |
3 Star |
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Recombination |
Slow-moving animation, but useful. |
4 Star |
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Electromagnetic spectrum
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| Nice short overview of the spectrum | From absorblearning.com | 4 Star |
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EM Spectrum broke into seven parts
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Introduction: Two Minute video from teachersdomain.org |
4 Star
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EM Spectrum in terms of Energy
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Similar to above |
4 Star
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Electromagnetic spectrum Applet:
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Click on the different parts of the spectrum for more info |
3 Star
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Feynman explains EM waves and the EM spectrum as only he can.
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Five minutes from Youtube. You may need to watch it a couple of times. Feynman himself is a legend. Check out the other links if you have time.
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5 Star
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| Imaging the milky way using different parts of the spectrum | From absorblearning.com | 5 Star |
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Imaging the human face using different sections of the spectrum |
From the wonderful Jacob Bronowski and his Ascent of Man. Youtube. 9 minutes |
5 Star |
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Radio Waves |
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Pulsars and Radio Waves
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Short Video - you need to register. Did you know that an Irish woman discovered pulsars? |
4 Star |
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A radio frequency Spectrum allocation chart for the USA.
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View at 100% magnification. Very impressive |
5 Star |
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Microwaves |
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Microwave Ovens
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Having fun with microwaves - list of videoclips on youtube. |
4 Star |
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How do microwave ovens work?
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Nice applet demonstrating the interaction between microwaves and water molecules, although the role played by resonance isn't alluded to.
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3 Star |
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Infra Red
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Infrared gallery - from Teachersdomain.org
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4 Star
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Nice videos, with Visible and Infra Red screens side by side. |
Takes half a minute to download, small screens. |
4 Star |
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Thermograms |
Used to detect breast cancer. Youtube. 3 minutes |
4 Star |
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Using InfraRed to image veins. |
Based on absorption and reflection. Youtube. 1 minute. |
4 Star |
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Taming of the shower-beast |
How do you look in infrared when you take a shower? Youtube. 2 minutes |
5 Star |
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Imaging with Infra red |
Six minute video from Youtube. At about 4:30, Infra-red imaging is used to show how Japanese bees use their bodies to cook an attacking hornet. Great stuff |
4 Star
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Investigate how Hershel discovered Infra red in the 1700's |
Hershel moved the thermometer just beyond the Red region of the spectrum and noticed that the temperature of a thermometer went up! |
4 Star |
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Ultra Violet |
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Dangers of tanning
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Youtube. 3 minutes. |
4 Star |
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Bees can see in UV |
Youtube. 1:30. |
4 Star |
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So can butterflies |
Youtube. 5:30. |
4 Star |
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UV penetration on tissue |
Simple animation |
4 Star |
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X-Rays |
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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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Xray images of Sword Swallowers in action |
Freaky |
4 Star |
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Short Video |
Youtube 20 secs of sword swallowing. |
3 Star |
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Sticky tape x rays |
Youtube. 30 seconds |
5 Star |
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Gamma-Rays |
Gamma Ray Bursts are the most powerful explosions in the universe. That we know of. Youtube. 9 minutes. |
5 Star | |
Bits and Bobs |
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What does an electromagnetic wave look like?
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Animation llustratrating both the electric and magnetic components.
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3 Star |
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How electromagnetic radiation is emitted and received:
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Use your mouse to drag the positive charge on the right up or down, then let it go to start it oscillating.
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4 Star |
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More complicated, but more impressive applet. From Phet.
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5 Star |
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See the Quantum Theory page for a list of links on this topic
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It seems that Light lies at the heart of all that is extremely strange in this world. |
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