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The objects that we see can be placed into one of two categories: luminous objects and illuminated objects. Luminous objects are objects that generate their own light. Illuminated objects are objects that are capable of reflecting light to our eyes. The sun is an example of a luminous object, while the moon is an illuminated object.
NGSS-LW Link
NGSS-LW Link
Students are able to apply understanding of how wave properties and the interactions of electromagnetic radiation with matter can transfer information across long distances, store information, and investigate nature on many scales. Models of electromagnetic radiation as either a wave of changing electric and magnetic fields or as particles are developed and used. Students understand that combining waves of different frequencies can make a wide variety of patterns and thereby encode and transmit information. Students also demonstrate their understanding of engineering ideas by presenting information about how technological devices use the principles of wave behavior and wave interactions with matter to transmit and capture information and energy.
The crosscutting concepts of cause and effect; systems and system models; stability and change; interdependence of science, engineering, and technology; and the influence of engineering, technology, and science on society and the natural world are highlighted as organizing concepts for these disciplinary core ideas. In the PS3 performance expectations, students are expected to demonstrate proficiency in asking questions, using mathematical thinking, engaging in argument from evidence, and obtaining, evaluating and communicating information; and to use these practices to demonstrate understanding of the core ideas.
26_LectureOutline.pptx27_LectureOutline.pptx28_LectureOutline.pptx30_ClickerQuestions.pptx26_LightAndTranspare_VID.mp429_PolarizedLight3d_VID.mp4The Speed of Light
The Speed of Light
The speed of any wave (v) is defined as the distance traveled (d) per time of travel (t) and is described by the following equation:
v = d / t
Thus, the distance traveled by a wave is related to the time required for it to travel that distance.
The speed of light, like the speed of any wave, is dependent upon the properties of the medium through which it is moving. For the problems in this problem set, the light waves are always moving through air or a vacuum. Unless told otherwise, a value of 2.998x108 m/s should be used for the speed of light.
Frequency-Wavelength-Speed Relationship
Frequency-Wavelength-Speed Relationship
Several questions in this problem set target your ability to analyze physical situations involving the wavelength-frequency-speed relationship. Any wave, whether a smechanical wave or a light wave, will have a wavelength-frequency-speed relationship which follows the wave equation:
v = f • λ
where v represents the speed (or velocity) of the wave, f represents the frequency of the wave, and λ represents the wavelength of the wave. As mentioned above, a value of 2.998x108 m/s should be used for the speed of light unless told otherwise.
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