| Category | Format | Size |
|---|---|---|
| Fifth Grade Science Volume 1, Textbook Edition | pptx | 6 MB |
"Light and Heat" Light PPT
Description
"Light and Heat" Light PPT
Part One Content: Intensity and Temperature of Light
Many light sources also generate heat when they emit light. While the sun brings us light, it also brings us warmth. What is the relationship between the amount of light and the intensity and temperature?
Light sources can be divided into two major categories, one is called hot light source, which emits light and generates heat, while some light sources are cold light sources, which emit light but do not generate heat.
Let's test our ideas with actual observations.
Use a mirror to project sunlight onto paper. Observe and compare using one mirror and multiple mirrors. What is the difference in the intensity of reflected light?
Use a thermometer to measure the temperature at the light spot on the paper. Compare using one mirror and multiple mirrors. What is the difference in the temperature displayed by the thermometer?
Light and heat PPT, part 2: How to form strong light
People found that concave mirrors and convex lenses can concentrate light to form strong light and high temperature.
Sunlight shines on a concave mirror and converges to a point after being reflected by the curved mirror surface. The light at this point is very strong and the temperature is very high.
Convex lenses like magnifying glasses can also focus sunlight and produce high temperatures.
In our country, people have known for a long time to use concave bronze mirrors to make fire. Now, our country still strongly advocates the use of solar cookers made based on the concave mirror principle to make full use of energy.
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For more information about the "Light, Light and Heat" PPT courseware, please click on the "Light ppt" light and heat ppt tab.
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Update Time: 2024-07-02
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