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"Shadows in the Sun" Light PPT Courseware 2
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.
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 same object in the sun at different times ( ).
A. The position remains unchanged. B. The direction remains unchanged. C. The length, position and direction all change.
3. The shadow of the flagpole in the sun is 5 meters long. After a while, the shadow of the flagpole becomes longer. This phenomenon occurs in ( ).
A. Morning B. Noon C. Afternoon
4. A 10 cm pencil stands upright on the ground in the sun. Its shadow is 5 cm long. At the same time, the length of the shadow of the flagpole is measured to be 2 meters. The actual height of the flagpole is approximately ( ) meters.
A. 2 meters B. 2.5 meters C. 4 meters
5. In ancient times, people used sundials to tell time. The principle is ( ).
A. The shadow of an object changes with time
B. The shadow of an object does not change with time.
6. The shadow of an object under the sun ( ) is the shortest throughout the day.
A. Morning B. Noon C. Evening
7. At 12 noon, the shadow of an object under the sun ( ) is the longest.
A. Spring and autumn B. Summer C. Winter
8. 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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