"Light and Heat" Light PPT Courseware 2

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"Light and Heat" Light PPT Courseware 2

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?

What is the relationship between the intensity of light and temperature?

In what ways can we prove it?

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?

judge

1. The side facing the sun is warmer than the side facing away from the sun. ( )

2. All light sources also generate heat while emitting light. ( )

3. You can use magnifying glasses and telescopes to look at the sun. ( )

4. The sun is the largest source of light and heat on the earth. ( )

5. In our country, people have long used concave mirrors to make fire. ( )

6. Solar cookers are made using the principle of convex lenses. ( )

7. Only concave mirrors can be used to make fire, convex lenses cannot be used to make fire. ( )

8. Strong light carries more heat than weak light. ( )

9. At the same time, the surface temperature of the cement pavement and the grass under the sun is the same. ( )

1. In the 18th century, British scientist Priestley discovered ( ) using convex lenses.

A. Air B. Oxygen C. Carbon dioxide

2. The Olympic flame is obtained using ( ).

A. Plane mirror B. Concave lens C. Concave mirror

3. The following is made using the principle of convex lens ( ).

A. Magnifying glass B. Solar stove C. Fun mirror

4. Use mirrors to project sunlight onto the paper. The more mirrors used, the temperature of the paper will increase ( ).

A. Higher B. Lower C. No change

5. Compare the heat of strong light and weak light ( ).

A. Strong light carries more heat. B. Weak light carries more heat. C. The same amount.

6. ( ) can concentrate sunlight to form strong light and high temperature.

A. Concave lens and convex lens B. Concave mirror and convex mirror C. Concave mirror and convex lens

7. Among the following environments, the one with the strongest light intensity is ( ).

A. Indoors B. In the woods C. Outdoors in the sun

draw a picture

1. What can concentrate sunlight to form high temperature and strong light are _______ and _______.

2. In the 18th century, British scientist Priestley used a convex lens to focus light to obtain high temperature to heat a chemical substance, thus producing _______.

3. Solar cookers are made using the principle of _______.

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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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"Light and Heat" Light PPT:

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Update Time: 2024-09-09

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