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# Sci 8- Unit 3: Topics 7-8

Alberta Curriculum, Science 8, Science 8 Curriculum, Light and Optical Systems, Unit 3- Topics 7-8, Science Focus 8, created by Kyle Swenson, Sturgeon School Division
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## kyle swenson

on 31 August 2018

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#### Transcript of Sci 8- Unit 3: Topics 7-8

The Wave Model of Light Unit 3: Light & Optical Systems
Topics 7-8 How does this work? Topic 7: The Wave
Sir Isaac Newton tried to explain why.
He proposed that light beams are made of streams of extremely tiny, fast-moving particles. These tiny particles of light, he suggested, could only travel in straight lines, not around objects. WRONG! Laser Light we now need to start thinking in terms of wavelengths... Laser light is a device for amplifying light to produce an intense, narrow beam. Explore these images Laser stands for
ight
mplification by the
timulated
mission of
A
S
E
R Laser light is coherent which means that it has only wavelength with all waves lined up in a similar pattern. The high parts of the wave are called crests.
The low parts of the wave are called troughs.
The distance from crest to crest is called wavelength (the distance from one complete crest and one complete trough). PARTS of the
WAVE MODEL OF LIGHT The height of the crest or the depth of the trough from rest position is called the amplitude.
The Frequency is the rate at which the crest and the trough move up and down.
The number of cycles in a period of time - which is usually measured in hertz, or cycles per second Incandescent light is incoherent which means that it has many different frequencies and wavelengths but the waves are not lined up. QUESTION:
Which one of these wavelenghts
has the bigger 'Amplitude' ? Topic 6-8
Wrap Up - p. 257
Questions 1-9 What can you tell me about each wavelength? Be as detailed as possible! How do X-rays work? 2 min. If these are the wavelengths
we CAN SEE, imagine what we can't....
http://searchnetworking.techtarget.com/definition/wavelength
http://science.hq.nasa.gov/kids/imagers/ems/waves3.html
http://www.sengpielaudio.com/calculator-wavelength.htm
http://home.uchicago.edu/~ras/astro3.html
http://cimss.ssec.wisc.edu/satmet/modules/spectrum/wavelength.html
http://cmb.physics.wisc.edu/tutorial/light.html
http://hosting.soonet.ca/eliris/remotesensing/bl130lec3.html
http://www.sciencephoto.com/media/227346/enlarge
http://spie.org/x42193.xml
http://lasersandlights.wordpress.com/2010/02/13/new-three-dimensional-laser-light-show-projectors-are-here/
http://www.beamq.com/200mw-green-laser-light-match-p-95.html