"Dispersion of Light" PPT teaching courseware on light phenomena

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"Dispersion of Light" PPT teaching courseware on light phenomena

Part One Content: Basic Knowledge Key Points

Knowledge point 1 Dispersion of light

1. Let a beam of sunlight pass through a prism to obtain various colors of light. This is the "dispersion" phenomenon of light; it can be seen that sunlight is complex color light (optional "monochromatic light" or "complex color light").

2. In common life situations, what is caused by the dispersion of light is (B)

A.Colorful flowers

B. A colorful rainbow

C.Colorful fireworks

D. Dazzling neon lights

Knowledge point 2: Mixing of colored lights

3. Regarding the three primary colors of light, which of the following statements is correct (C)

A. Mixing red light and green light can produce blue light

B. Mixing red light and blue light can produce green light

C. Red light, green light and blue light can be synthesized into purple light

D. Mixing orange light, yellow light and indigo light can produce any other color of light

4. Use a magnifying glass to observe the color TV screen. You will see the three-color luminous area arranged in an orderly manner (A)

A. Red, green, blue B. Red, yellow, blue

C. Red, yellow, purple D. Yellow, green, purple

Dispersion of light PPT, part 2: improvement of comprehensive capabilities

8. (Huanggang High School Entrance Examination) After passing through a prism, sunlight is decomposed into several colors of light: red, orange, yellow, green, blue, indigo, and violet (as shown in the picture). This experiment not only shows that white light is composed of various It is a mixture of colored lights, and it shows that the degree of deflection of red light after passing through a prism is smaller than that of other colors of light. It can be inferred from this that red light propagates fastest in a prism.

9. In late autumn, a thousand-year-old ginkgo tree in an ancient temple in the mountains attracted many tourists. Under the sun, the ginkgo leaves on the tree were yellow because the leaves reflected yellow light. Xiao Ming blocked the red color filter in front of the camera lens and gave the ginkgo leaves Take a photo, the color of the ginkgo leaves in the photo is black.

10. In order to solve the problem of fire extinguishing in high-rise buildings, the military-industrial "missile fire extinguishing" technology was successfully tested for civilian use. As shown in the picture, there are three eyes on the launcher: "visible light", "infrared" and "laser". When there is smoke in the high-rise building and the source of the fire is unknown, infrared can be used to find the fire source, and laser can be used to accurately measure the distance to the fire source (optional "fill in all" visible light" "infrared" or "laser").

11. When you walk into the weather station, you can see the shutter box as shown in the picture. The main measuring instruments in the box include a dry and wet bulb thermometer and two thermometers (a thermometer that measures and records the highest temperature and the lowest temperature of the day). The surface of the louver is painted white to reflect (optional "reflection" or "absorption") sunlight and prevent the infrared rays (optional "infrared" or "ultraviolet") in the sunlight from affecting the temperature inside the box when exposed to sunlight. Impact.

12. Which of the following statements is correct (A)

A. Welders must wear protective goggles when welding, mainly to prevent ultraviolet rays from harming human eyes.

B. Mobile phones use ultrasonic waves to transmit signals

C. Microwave ovens use infrared rays to heat food

D. Ultraviolet rays cannot propagate in a vacuum

13. The blue paper looks black when viewed through the yellow glass. This is because (C)

A. The yellow glass dyes the light reflected from the blue paper black

B. The light reflected by the blue paper passes through the yellow glass and the yellow light emitted by the yellow glass mixes into black light.

C. The yellow glass absorbs almost all the colored light reflected by the blue paper, so no light passes through the yellow glass.

D. The yellow glass reflects all the blue light, so no light passes through the yellow glass.

14. In the absence of any other lighting, the green light emitted by the stage spotlight shines on the actor wearing a white top and red skirt, and the audience sees her (B)

A. The whole body is green

B. The top is green and the skirt is black

C. The top is green and the skirt is red

D. The top is green and the skirt is purple

15. The infrared night vision device as shown in the picture can conduct reconnaissance at night. The principle it is based on is (D)

A. Different materials and structures are different

B. Different objects emit different colors of light

C. It emits red light at night and can reach different objects

D. Different objects have different temperatures and emit different infrared intensities.

Dispersion of light PPT, Part 3: Expanding exploration and breakthroughs

18. Some parts of banknotes are marked with fluorescent substances. Identifying these marks under ultraviolet light is an effective anti-counterfeiting measure. A classmate conducted three experiments as shown in the picture in a darker environment.

(1) As shown in Figure A, he illuminated a 100-yuan banknote with an ultraviolet lamp and saw the word "100" glowing. This shows that ultraviolet rays can make fluorescent substances glow;

(2) As shown in Figure B, he illuminated a piece of transparent glass with an ultraviolet lamp, adjusted the position and angle of the transparent glass, and saw the word "100" on the banknote glowing again, which shows that ultraviolet rays can be reflected by the transparent glass;

(3) As shown in Figure C, he placed the piece of transparent glass between the ultraviolet lamp and the banknote, and let the ultraviolet lamp shine directly on the glass. No matter how he moved the banknote on the other side, the word "100" did not light up. He This experiment was done to explore whether ultraviolet rays can pass through glass.

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"Dispersion of Light" PPT courseware download of light phenomena:

"Dispersion of Light" PPT courseware download on light phenomena Part 1: Classification practice of knowledge points Knowledge point 1 Dispersion of light 1. As shown in Figure 4-5-1, sunlight is white light. After passing through a prism, sunlight is decomposed into light of various colors. This phenomenon is called _____ of light. ..

"Dispersion of Light" PPT download of light phenomena:

"Dispersion of Light" Light Phenomenon PPT Download Part One: New Knowledge Summary 1. Dispersion Dispersion of light: The phenomenon that sunlight is decomposed into seven colors of light after passing through a prism. A rainbow is caused by sunlight being transmitted through the air...

"Dispersion of Light" Light Phenomenon PPT:

"Dispersion of Light" PPT on Light Phenomenon Part One: Preview Perception 1. Dispersion 1. Discovery: In the 17th century, the British physicist ________ discovered. 2. Concept: The phenomenon of sunlight being decomposed into _______________ through a prism. 3. Seven colors of light: red, __..

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Update Time: 2024-07-30

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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