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4F Motion #3
Accelerating electric charges produce electromagnetic waves around them....
4F Motion #5
Because the light seen from almost all distant galaxies has longer wavelengths than comparable light here on earth, astronomers believe that the whole universe is expanding....
4F Motion #6
Waves can superpose on one another, bend around corners, reflect off surfaces, be absorbed by materials they enter, and change direction when entering a new material....
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Ultrasound: How Does it Work?
http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=52
Description
This simulation explores ultrasound imaging as a technique used to see inside an object (such as the human body). It consists of three modules. In the first, students are introduced to the technology behind the ultrasound. The second module shows how waves get reflected as they travel through objects. The final module shows how the measurement of the reflected waves can be used to produce an image of what is taking place inside a body.
Using the Resource
This animation would be useful to show students a real-world application of the science behind a commonly used technology. This resource would best be used after classroom instruction and lab work on motion and waves.
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Created :08/21/2002 |