"How Light Spreads" Light PPT Courseware 2

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"How Light Spreads" Light PPT Courseware 2

Question 1: Changes in the length of the shadow: _____ in the early morning, gradually becoming _____, _____ at noon, then becoming _____, and _____ when the sun is about to set in the west.

Question 2:

The sun rises in the east in the morning, and its shadow is in the _____ direction;

At noon the sun is in the south and the shadow is in the _____ direction;

In the afternoon, the sun moves from south to west, and the shadow moves from _____ to _____;

The sun sets, and the shadow points in the _____ direction.

Question 3:

1. The direction of the shadow is the same as the direction of the sun. ( )

2. A pencil shadow that is ten centimeters long is also ten centimeters long. ( )

3. When the sun is at its highest position during the day, the shadow is also longest ( )

4. The shadow at noon is the same length all year round. ( )

Other examples that demonstrate that light travels in straight lines:

1. Use a flashlight to shine into the sky at night, and you can see a straight beam of light.

2. Using a laser pointer, you can see the linear propagation of light.

3. Use a straw and look at the light through the straw. If it is straight, you can see it, but if it is bent, you cannot see the light. These all show that light propagates in straight lines.

Light travels in straight lines.

Light travels very fast, about 300,000 kilometers per second. The distance of the sun from the earth is 150 million kilometers, and it takes about 8 minutes for the light from the sun to reach the earth.

Key points of this section:

Light travels in straight lines

The speed of light propagation is 300,000 kilometers per second.

It takes 8 minutes for light from the sun to reach the earth.

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For more information about the PPT courseware "How Light Spreads", please click the ppt tag of "How Light Spreads".

"How Light Spreads" Light PPT Download:

"How Light Spreads" Light PPT Download Part One Content: Introduction to the New Lesson In the early morning, the sun comes out and the room is filled with sunlight; at night, you turn on the flashlight and the light illuminates the road ahead. When light illuminates objects around us, have we ever thought about where it comes from and...

"How Light Spreads" Light PPT:

"How Light Spreads" Light PPT Part One Content: Experimental Exploration Exploration Content: 1. How does light propagate? 2. How are shadows formed? Light propagates dispersedly. Light propagates in a straight line. Light propagates in all directions... How does light propagate...

"How Light Spreads" Light PPT Courseware 5:

"How Light Spreads" Light PPT Courseware 5 Key points of the previous section: 1. The direction of the shadow of an object under sunlight changes with the change of the direction of the sun. The shadow is always opposite to the direction of the sun. 2. The change in the length of the shadow of an object under sunlight is As the sun's position in the sky changes...

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Update Time: 2024-11-20

This template belongs to science courseware Fifth Grade Science Volume 1, Textbook Edition industry PPT template

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