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Light Waves

What is light? YouTube. 8 mins. Wonderful way to introduce the history from a historical perspective. From 1veritasium
5 Star
Light Fantastic YouTube. One hour long, but in class just watch first few minutes to set the scence.
Wonderfully dramatic introduction to the incredible history of light. Unless you've already seen it from chapter one
5 Star
What's the big deal with Quantum Theory? Dr Quantum explains.
5 Star
Interference
Nice way of explaining the interference pattern 1veritasium on YouTube. 6 mins. Also follows on from the Dr Quantum video above. Light is simply head-wrecking.
4 Star
Parallel Universes: Many Worlds One attempt to make sense of some of these bizarre results.
YouTube. 3 mins
4 Star
Wonderful example of diffraction and interference of light Using a laser and thin wire.
Courtesy of the Royal Institution technicians. 4 mins
4 Star
       
Young’s Slits Applets
Simple Introduction . Play with the variables after first predicting what will happen.
4 Star
Rotate the view on top and play with the variables on the bottom
5 Star
nlamda = d Sin theta Applets
Nice presentation of the significance of the diffracted angle, theta.
5 Star
Ideal to demonstrate Path Difference
5 Star
 
 
Petrol film and Soap Bubbles
Takes a bit of work to figure out what's happening - read the instructions
4 Star
A more basic simulation, but you can change the thickness of the bubble
3 Star
Series of pictures set to music. One minute from YouTube
4 Star
       
Why do we see different colours? The NakedScientists explain via YouTube 4 Star
 
 
Colour and Wavelength
Notice that when wavelength changes so does frequency.
4 Star
Notice also the effect of slit-width on diffration.
4 Star
 
 
Polarisation
Nice for demonstrating the unpolarised wave
4 Star
You can insert and remove the polarisers, and rotate them
4 Star
Putting the polariser over the sun has no effect, but puting it over the water and rotating it does.
4 Star
You can rotate the polarizers
3 Star
Nice summary which explains polarisation at a deeper level. From Sixty Symbols on YouTube. 9 mins
4 Star
Polarised sunglasses Watch them prevent glare from glass buildings and from water. YouTube. 1 min
5 Star
Colour Mixing      
The colours we see depend on physiology, not physics I offer you exhibit A; the mantis shrimp
5 Star
  Colour-mixing exercise. 'Magenta'. Who the heck ever heard of magenta?
3 Star
Try the following head-wrecking exercise, called the 'Stroop' effect. From YouTube. One minute
4 Star
Dispersion
 
 
Dispersion of light by prism
Play with the different filters
3 Star
And by a Water Sprinkler
YouTube. 2 minutes. I think this is why they say a little knowledge is a dangerous thing.
5 Star
Dispersion in rainbows
Slow-moving animation, but useful.
3 Star
Explanation of the double rainbow Excellent - from a news clip. YouTube. 1 min
4 Star
Recombination
Slow-moving animation, but useful.
4 Star
 
 
Electromagnetic spectrum
Why life-forms don't 'see' radio waves Interesting blog post  
Nice short overview of the spectrum From absorblearning.com
4 Star
EM Spectrum broke into seven parts
Introduction: Two Minute video from teachersdomain.org
4 Star
EM Spectrum in terms of Energy
Similar to above
4 Star
Another video of the EM spectrum Youtube. 5 minutes
4 Star
Electromagnetic spectrum Applet:
Click on the different parts of the spectrum for more info
3 Star
Feynman explains EM waves and the EM spectrum as only he can. 5 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. 5 Star
Imaging the milky way using different parts of the spectrum From chromoscope.net
5 Star
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
 
Radio Waves
 
 
Pulsars and Radio Waves
Short Video - you need to register. Did you know that an Irish woman discovered pulsars?
4 Star
A radio frequency Spectrum allocation chart for the USA.
View at 100% magnification. Very impressive
4 Star
Want to know how much it costs to buy part of the electromagnetic spectrum?
Warning: it may be just for Ireland, but it will still cost you
3 Star
       
Microwaves
 
 
Microwave Ovens
Having fun with microwaves - list of videoclips on youtube.
4 Star
How do microwave ovens work?
Nice applet demonstrating the interaction between microwaves and water molecules, although the role played by resonance isn't alluded to.
3 Star
Using a microwave to melt glass From Bang Goes the Theory. YouTube. 3 mins
5 Star
Demonstrating properties of microwaves
MyYouTube. 9 mins
       
Infra Red
Infrared gallery - from Teachersdomain.org
4 Star
Some cool images taken in infrared. I like the binbag one the best. So never hide inside a binbag when snakes are around.
4 Star
Nice videos, with Visible and Infra Red screens side by side.
Takes half a minute to download, small screens.
4 Star
Thermograms
Used to detect breast cancer. Youtube. 3 minutes
4 Star
More than the eyes can see Looking at objects in the InfraRed. YouTube. 5 mins. The plastic bag and glass are my favourites. Also relates this to Global Warming.
4 Star
Using InfraRed to image veins.
Based on absorption and reflection. Youtube. 1 minute.
4 Star
Taming of the shower-beast

How do you look in infrared when you take a shower? Youtube. 2 minutes

5 Star
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
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!
Limited to 5 minutes

4 Star
 
 
Ultra Violet
 
 
Dangers of tanning
Youtube. 3 minutes.
4 Star
butterflies can see in UV
Youtube. 5:30.
4 Star
UV penetration on tissue
Simple animation absorblearning.com
4 Star
 
 
X-Rays
X-ray images
Drag the viewing frame around the palm of the hand to see its x-ray image
4 Star
Lots more x-ray images
4 Star
Xray images of Sword Swallowers in action
Freaky
4 Star
Short Video
Youtube 20 secs of sword swallowing.
3 Star
Sticky tape x rays
Youtube. 30 seconds
5 Star
Simple interactive animation on the penetrating power of x-rays
From absorblearning.com
4 Star
Gamma-Rays
Could a gamma ray burst destroy the earth? 2 min video from howstuffworks.
4 Star
How were gamma rays discovered? By looking for evidence of nuclear testing during the cold war. 3 min video from teachersdomain.org
4 Star
       
What happens when you travel close to the speed of light on a moped? Carl Sagan on time-dilation and the Doppler Effect
4 Star
Bits and Bobs
 
 
Neil Harbisson is colour-blind but can 'hear' colour. TED talk. 10 mins.
4 Star
       
What does an electromagnetic wave look like?
Animation llustratrating both the electric and magnetic components.
3 Star
How electromagnetic radiation is emitted and received:
Use your mouse to drag the positive charge on the right up or down, then let it go to start it oscillating.
4 Star
More complicated, but more impressive applet. From Phet.
5 Star
See the Quantum Theory page for a list of links on this topic
It seems that Light lies at the heart of all that is extremely strange in this world.
       
Lasers in the classroom Safety document from CLEAPPS  
For teachers: what lasers are safe to use?
Text-based
The hazards of the green laser Text-based