"How to Get More Light and Heat" Light PPT download

Description

"How to Get More Light and Heat" Light PPT download

Part One Content: New Lesson Exploration

The sun is a huge burning fireball with an external temperature of more than 6,000 degrees and an internal temperature of more than 20,000 degrees. It radiates light and heat into the universe day and night. It is the largest light and heat source on the earth. The solar energy received by the earth only accounts for one billionth of the energy radiated by the sun, but it makes our earth full of vitality.

In addition to concave mirrors and convex lenses to concentrate sunlight, is there any other way to concentrate sunlight to obtain light and heat? Let’s find out through experiments!

Research direction

Color and heat absorption of objects

Direct sunlight, oblique radiation and heat absorption

Experiment find-outs:

Smooth, wrinkle-free black waxed paper is more reflective and has a weaker ability to absorb light. Black matte paper is relatively less reflective and has a stronger ability to absorb light. Therefore, black waxed paper heats up more slowly than black matte paper. .

How to get more light and heat PPT, part two: exploring applications

What color are astronauts' clothes?

Why is it designed this color?

Astronauts’ clothes are usually silver

The purpose is to reduce radiation

Why are solar water heaters designed this way?

In order to make the illumination angle perpendicular to the sun, get more light and heat.

What is the design principle of a solar cooker?

The tilted placement of the solar cooker focuses a larger area of ​​sunlight onto the bottom of the pot, raising the temperature to meet cooking requirements. It is designed on the same principle as a solar water heater.

How to get more light and heat PPT, Part 3: Class summary

1. Object color and heat absorption

Dark colors heat up faster than light colors

Rough surfaces heat up faster than smooth surfaces

2. Direct sunlight, oblique radiation and heat absorption

Intensity of light from direct sunlight

Weak light from oblique sunlight

How to get more light and heat PPT, Part 4: Classroom training

1. Fill in the blanks

1. Different colors of paper absorb heat ( ), and ( ) colored objects absorb heat quickly.

2. People can use ( ) and ( ) to concentrate light and absorb more heat from the sun.

3. If the red cup and the green cup are filled with water and placed in the sun, ( ) the water in the cup will be hotter.

2. Choice

1. Put three identical paper tubes of red, white and black in the sun at the same time. The one with the slowest temperature rise is ( )

A. White B. Red C. Black D. As fast

2. Place the same object in the sun, and the temperature rises fastest when placed in ( ).

A. Perpendicular to the sun B. Perpendicular to the ground

C. Level with the ground D. Same as

How to get more light and heat PPT, Part 5: Homework

Read the information to understand the structure and principles of solar water heaters.

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Black matte fabric PPT background image:

This is a black matte fabric PPT background image, keywords: black fabric, wood grain slide background image. .jpg format;..

Two yellow cartoon white clouds and sunshine PPT background pictures:

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Four abstract light and shadow PPT background pictures:

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Update Time: 2024-09-23

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

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