"Shadows in the Sun" Light PPT Courseware 3 Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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"Shadows in the Sun" Light PPT Courseware 3
1. What is a light source? An object that emits its own light is called a light source.
2. What is projection? The shadow of an object illuminated from different sides is called a projection.
Which of the following are light sources?
Incandescent lamp, lit fluorescent lamp, sunlight, moonlight, laser, mirror, electric lamp
The length of the shadow changes: it is long in the early morning, gradually becomes shorter, is shortest at noon, then becomes longer, and is longest when the sun is about to set in the west.
When the sun is at its highest, the shadow is the shortest, and when the sun is at its lowest, the shadow is the longest.
Key points of the previous lesson:
1. Conditions for producing shadows: light source, obstruction and screen, and the obstruction must be between the light source and the screen.
2. Objects that can emit light by themselves are called light sources.
3. The length and direction of the object's shadow change with the change of the position and direction of the light source; the size of the object's shadow is related to the distance between the object and the light source; the shape of the object's shadow is related to the shape of the side of the object illuminated by the light source.
4. The shadow of an object illuminated from different sides is called projection, and projection is very useful in our lives.
judge
1. The shadow of an object under the sun does not change throughout the day. ( )
2. The shadow of an object is always on the side backlit by the sun. ( )
3. The shorter the shadow, the higher the position of the sun. ( )
4. When the sun rises in the east in the morning, the shadow of the object is in the east. ( )
5. At the same time, the shadows of different objects under the sun have the same direction. ( )
1. At the same time, the shadows of different objects in the sun ( ).
A. Same shape B. Same direction C. Same length
2. The shadow of the flagpole is 5 meters long in the sun. After a while, the shadow of the flagpole becomes longer. This phenomenon occurs in ( ).
A. Morning B. Noon C. Afternoon
3. During the day, the shadow of an object under the sun ( ) is the shortest.
A. Morning B. Noon C. Evening
4. At 12 noon, the shadow of an object under the sun ( ) is the longest.
A. Spring and autumn B. Summer C. Winter
5. The light on the earth mainly comes from ( ).
A. sun B. electric lamp C. torch
Key points of this 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 length of the shadow of an object under sunlight changes with the position of the sun in the sky. When the sun is at its highest position, the shadow is the shortest, and when the sun is at the lowest position, the shadow is the longest.
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