| Category | Format | Size |
|---|---|---|
| Lu Jiao edition eighth grade physics volume 1 | pptx | 6 MB |
"Propagation of Light" PPT courseware on light phenomena 9
Description
"Propagation of Light" PPT courseware on light phenomena 9
propagation of light
1. Understand what a light source is
2. Understand the propagation of light along straight lines and its applications
3. Understand the speed of light propagation in vacuum and air
In a dark room, we can't see anything. Why?
1. Light source: an object that can emit light
think?
How does light travel?
2. Propagation of light
Explore
1. Ask the question: How does light propagate?
2. Guess:
3. Design experiments:
4. Conduct experiments:
5. Analysis and argumentation:
6. Conclusion: Propagation along straight lines in the same homogeneous medium
Light:
A straight line representing the path and direction of light propagation
summary:
1. An object that can emit light is called a light source;
2. Light propagates along straight lines in the same homogeneous medium. Shadows and solar eclipses are phenomena caused by light propagating along straight lines;
3. The speed of light in vacuum is 3×108 meters/second.
About 3×105 kilometers/second.
practise:
1. Which of the following objects is a light source ( )
A. The moon B. Fireflies C. Stars at night
D. Polished metal that shines under the sun E. Mirror
2. When lining up in a column, if you see a classmate in front of you blocking all the people in front of you, the line will be straightened. This can be explained by ______.
3. When a person walks along the street towards the street lamp, and then walks away from the street lamp, the change in the length of his shadow is ( )
A. Become longer B. Become longer first and then become shorter
C. become shorter D. first become shorter and then longer
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For more information about the "Light Phenomena and the Propagation of Light" PPT courseware, please click on the "Light Phenomenon PPT Propagation of Light PPT" tab.
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"Propagation of Light" PPT courseware on light phenomena 8:
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Update Time: 2024-07-01
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