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Waves
Transverse Waves |
Nice basic Applet. You can change Frequency, Wavelength or Amplitude |
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Rubber Duckie in water |
Notice that duckie only bobs up and down.
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Longitudinal travelling wave |
As above
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Another simple animation from absorblearning.com |
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Longitudinal and Transverse Wave |
Get
the pupils/students/learners to choose one spot and follow it |
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Standing waves in Open and Closed tubes |
you can also see the various harmonics
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| Beautiful images of standing waves created by christmas lights | From flickr.com |
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Diffraction and wavelength |
Notice that diffraction is most noticeable when slit width is same as wavelength |
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Animation of radio waves diffracting around a hilltop. From absorblearning.com |
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Notice colour also changes with wavelength |
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Lovely animation to show that sound diffracts around corners but light doesn't. |
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Interference
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Soundwaves: animation of constructive and destructive interference |
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Add two waves to see the Amplitude of the resultant. Then put one wave 180 degrees out of phase. |
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Scroll down to the "Phase Difference" section and vary the phase difference between both waves. |
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Drag one set of concentric circles over the other and notice the lines of constructive and destructive interference |
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Virtual Ripple Tank |
Click on "Setup: Two Sources" |
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Play with the different tabs. Excellent!! From Phet |
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A short movie showing interference with a ripple tank: |
You don't want to know how finicky it is to set up the real thing, so this is not a bad back-up plan |
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The Doppler Effect: |
YouTube videoclip of a fire engine passing by an observer. Do a search on the site for lots of other examples. 20 seconds. |
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Here we can see the waves as they emanate from the source. You can pause at any stage. |
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Did you know this was first demonstrated by Doppler himself using a band on an open-top train? Seriously! |
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| Drag the slider to give the fire engine a velocity. | From absorblearning.com |
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The Doppler and Red Shift |
Now this is more like it! It's got a little bit of everything. USeful for explaining Red Shift. From teachersdomain |
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Hubble and Red Shift |
Short video from teachersdomain |
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And now for something completely different . . . |
Explaining the Doppler Effect with Trolls. From YouTube. 3:30 |
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Explaining the Doppler Effect with an Astronomer, a flying saucer and a cow (naturally). From YouTube. 2:30 |
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