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Light Waves

Safety using lasers      
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 from universetoday.com  
8 Important Safety Tips to Keep in Mind When Using Your Laser Pointer link Useful advice before buying. From ebay.  
       
What is light? link YouTube. 4 mins. 5 Star
  YouTube. 8 mins. Wonderful way to introduce the history from a historical perspective. From 1veritasium
5 Star
Light Fantastic YouTube. 3 mins. Enter the title in YouTube if this link is down.
Wonderfully dramatic introduction to the incredible history of light. Unless you've already seen it from chapter one
5 Star
Aether: The Greatest Failed Experiment Ever link YouTube. 4 mins. From SciShow Space  
What's the big deal with Quantum Theory? Dr Quantum explains. YouTube. 5 mins
See the Quantum Theory page for a list of links on this topic link It seems that Light lies at the heart of all that is extremely strange in this world. 5 Star
       
Why is glass transparent? link Youtube. 5 minutes.
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
Interference of radio waves.
There was a LC question on this in 2002
YouTube. 3 mins.
4 Star
A butterfly uses this to good effect to give colour to its wings
YouTube 4 minutes
4 Star
       
Young’s Slits Applets link Simple Introduction . Play with the variables after first predicting what will happen. micro.magnet.fsu.edu 4 Star
nlamda = d Sin theta Applets
Rotate the view on top and play with the variables on the bottom
surendranath.org
5 Star
  link Ideal to demonstrate Path Difference
galileo.phys.virginia.edu
5 Star
Why do we see different colours?    
Why do flame tests work? The NakedScientists explain via YouTube
4 Star
Is Your Red The Same as My Red? "Colour is an illusion". vSauce explain. YouTube
4 Star
There is no pink light
Minutephysics via YouTube 1 minute
4 Star
  How different animals see the world. Series of images
4 Star
The colours we see depend on physiology, not physics I offer you exhibit A; the mantis shrimp. From theoatmeal.com
5 Star
Which is why the whole 'Roy G Biv' lark is a fallacious. Blogpost from pballew.blogspot.ie  
       
Colour and Wavelength
Notice that when wavelength changes so does frequency.
From micro.magnet.fsu.edu
4 Star
       
Polarisation    
How Do Polarized Sunglasses Work? link From SciShow on YouTube. 3 mins 3 Star
Nice summary which explains polarisation at a deeper level. From Sixty Symbols on YouTube. 9 mins
4 Star
Similar to above but much older Youtube 8 minutes
4 Star
Polarised sunglasses Watch them prevent glare from glass buildings and from water. YouTube. 1 min
5 Star
Using polarisation in LCD screens Youtube 5 minutes
3 Star
Polarized light throws birds' magnetic compass off course link From physicsworld.com  
     
Dispersion      
Dispersion of light by prism link Play with the different filters. From freezeray.com 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 link Slow-moving animation, but useful. From tutorvista.com 3 Star
Explanation of the double rainbow Excellent - from a news clip. YouTube. 1 min
4 Star
Recombination link Slow-moving animation, but useful. From tutorvista.com 4 Star
 
Electromagnetic spectrum
A nice introduction from TED-Ed Youtube. 5 minutes
4 Star
Why life-forms don't 'see' radio waves Interesting blog post whyevolutionistrue.wordpress.com
Nice short overview of the spectrum From absorblearning.com
May only work with Internet Explorer
4 Star
Another video of the EM spectrum Youtube. 5 minutes
4 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

The first moments of a solar flare, captured at different wavelengths.

twitterpic from @IFLScience
4 Star
Radio Waves
 
A radio frequency Spectrum allocation chart for the USA. link View at 100% magnification. Very impressive 4 Star
Want to know how much it costs to buy part of the electromagnetic spectrum? link Warning: it may be just for Ireland, but it will still cost you comreg.ie
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
Galleries of images and YouTube videos link From worldofwarmth.com  
Some cool images taken in infrared. I like the binbag one the best. So never hide inside a binbag when snakes are around. From coolcosmos
4 Star
Nice videos, with Visible and Infra Red screens side by side.
Takes half a minute to download, small screens. From coolcosmos
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
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 explorelearning.com

4 Star
 
Ultra Violet
 
Tanaholics - dangers of tanning
Youtube. 3 minutes.
4 Star
Wanna see what you look like in UV? And why we need sunscreen. Youtube. 3 minutes.
5 Star
UV penetration on tissue
Simple animation absorblearning.com
May only work with Internet Explorer
4 Star
Did you know that butterflies can see in UV?
Youtube. 5:30.
4 Star
 
X-Rays
Lots more x-ray images
Doesn't work with google chrome
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
May only work with Internet Explorer
4 Star
       
Gamma-Rays
What happens when you travel close to the speed of light on a moped? Carl Sagan on time-dilation and the Doppler Effect Youtube. 4 mins
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? link Animation llustratrating both the electric and magnetic components walter-fendt.de 4 Star
       
Mandatory experiment: To measure the wavelength of monocrhomatic light link Using laser light. From surendranath.org 4 Star
  link Using a spectrometer. From mathsphysics.com
4 Star
  link YouTube video from c4science 4 Star