"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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Update Time: 2024-11-19

This template belongs to Physics courseware Lu Jiao edition eighth grade physics volume 1 industry PPT template

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