People's Education Edition Physics for Grade 8, Volume 2
People's Education Edition Ninth Grade Physics Complete Book
Shanghai Science Edition Ninth Grade Physics
People's Education Edition Physics for Grade 8, Volume 1
Shanghai Science Edition 8th Grade Physics
Beijing Normal University eighth grade physics volume one
Lu Jiao Edition Ninth Grade Physics Volume 1
Beijing Normal University Ninth Grade Physics Volume 1
Lu Jiao Edition Ninth Grade Physics Volume 2
Lu Ke Edition High School Physics Compulsory Course One
Guangdong and Shanghai Edition Ninth Grade Physics Volume 1
People's Education Press High School Physics Compulsory Course II
Guangdong and Shanghai version of eighth grade physics volume 2
Beijing Normal University Ninth Grade Physics Volume 2
Lu Jiao Edition Eighth Grade Physics Volume 2
Guangdong and Shanghai Edition Ninth Grade Physics Volume 2
!["Linear Propagation of Light" Light Phenomenon PPT Courseware 4](https://resources2020.oss-cn-beijing.aliyuncs.com/resources2020/d4fc817613f4f7613f18678c2c405cfc.jpg)
Category | Format | Size |
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People's Education Edition Physics for Grade 8, Volume 1 | pptx | 6 MB |
Description
"Linear Propagation of Light" Light Phenomenon PPT Courseware 4
1. Light source: an object that can emit light on its own
Such as: sun natural light source
Candles, lamps, flashlights, etc. Artificial light sources
2. Propagation of light
1. Demonstration experiment:
Use a laser pointer to shoot into a container filled with smoke and observe the path of light propagation. What can we see about the propagation of light in the air?
Conclusion: Light propagates along ( ) in ( ) medium.
2. Light: a straight line indicating the propagation direction of light
3. Applications and examples of straight line propagation of light
A. Laser alignment (using laser to guide tunnel boring machine)
(Characteristics of laser: It can be concentrated in one direction without scattering, so it can shoot very far without obvious reduction in brightness)
B. When lining up, look forward
C. Formation of shadow: Since light propagates along a straight line, when light encounters an opaque object during propagation, a shadow is produced behind the object.
(1) Causes of shadow formation
During the propagation process of light, it encounters an opaque object. Since light propagates in a straight line, the light cannot reach the back of the opaque object, and the dark part is the shadow of the object.
4 Propagation of light
The propagation of light does not require a medium
B The propagation speed of light in vacuum C= 3×108m/s
The speed of light propagating in water is three-quarters of that in a vacuum.
The propagation speed in glass is two-thirds that in vacuum
The distance that light travels in the air in 1 second is equivalent to 7.5 times around the earth. It only takes 1.3 seconds for light to travel from the moon to the earth.
Want to discuss:
Can you think of a way to estimate how far away a lightning strike is from you?
Answer: (ignore the propagation time of light)
After seeing lightning, immediately look at your watch and note the time; wait a few seconds before hearing thunder.
Using the speed of sound in the air, the distance to the lightning can be found according to s=vt.
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, 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
Keywords: light phenomenon teaching courseware, linear propagation of light teaching courseware, People's Education Edition eighth grade physics PPT courseware download, eighth grade physics slide courseware download, light phenomenon PPT courseware download, linear propagation of light PPT courseware download, .PPT Format;
For more information about the PPT courseware "Light Phenomena: Linear Propagation of Light", please click on the "Light Phenomena ppt: Linear Propagation of Light" ppt tag.
"Linear Propagation of Light" Light Phenomenon PPT Courseware 8:
"Linear Propagation of Light" Light Phenomenon PPT Courseware 8 Teaching Objectives: 1. Be able to identify light sources and know that light sources can be roughly divided into natural light sources and artificial light sources. 2. Understand the linear propagation of light and be able to list the applications of linear propagation of light in life. 3. Know the speed of light in vacuum..
"Linear Propagation of Light" Light Phenomenon PPT Courseware 7:
"Linear Propagation of Light" Light Phenomenon PPT Courseware 7 Colorful Light Phenomenon 1. What is a light source? 2. How does light propagate? How to express the propagation route of light? 3. What are the applications of light propagation? 4. How fast does light travel? 5. The world of science: light years.....
"Linear Propagation of Light" Light Phenomenon PPT Courseware 6:
"Linear Propagation of Light" Light Phenomenon PPT Courseware 6 1. Light source 1. Light source: An object that can emit light is called a light source. 2. Light sources are divided into two categories: natural light sources and artificial light sources. Natural light sources: stars (such as the sun), fireflies, luminous jellyfish, etc. Artificial light source: electric...
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Update Time: 2024-09-03
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