"Linear Propagation of Light" PPT courseware download on light phenomena

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"Linear Propagation of Light" PPT courseware download on light phenomena

The first part of the content: Practice on classification of knowledge points

Knowledge point 1 Light source

1. Please divide the following objects into two categories according to certain standards.

Lighted candles, sun, moon, glowing fireflies, eyes, batteries.

(1)The classification standard you choose is ____________________.

(2) The first category has _______________, and their common feature is _______________; the second category has _______________, and their common feature is _______________.

2. Which of the following statements about light sources is correct ()

A． Any object with light spreading outward is a light source

B. Electric lights are the source of light at all times

C. Not all stars in the universe are sources of light

D. "The bright moonlight before the bed" indicates that the moon is the source of light

3． Many objects in life can emit light. Which of the following objects is not a light source ()

Knowledge point 2: Straight line propagation of light

4. Regarding the propagation of light, which of the following statements is correct ()

A． Light cannot travel in straight lines in liquids

B. Light travels in straight lines only in air

C. Light travels in straight lines under any circumstances

D. Light propagates along straight lines in the same homogeneous medium

5. When studying the propagation of light, in order to simplify the problem, light is introduced. This research method is ()

A． equivalent substitution method

B. model method

C. Control Variable

D. conversion method

6. Light can travel through substances such as air, water, and glass. These substances are called _____. Figure 4-1-2 shows the propagation of light in water. The propagation characteristics of light in air and glass are similar to those in water. It can be seen that light _________ in the same homogeneous medium.

7. Xiao Ming took a picture of the scenery shown in Figure 4-1-3 during his spring outing. This picture shows that light __________ in the air. Please give an example of using this principle: __________.

Knowledge point 3: The propagation speed of light

8. The cartoon shown in Figure 4-1-4 shows that the propagation speed of light is very fast. We know that the speed of light in vacuum is the maximum speed in the universe. Under normal circumstances, the speed of light in vacuum can be approximately taken as c=________m/s= ________km/s. The order of the propagation speed of light in glass, water, and air from large to small is _____________.

9. Regarding the speed of light, which of the following statements is incorrect ()

A． The propagation speed of light is always 3.0×108 m/s

B. The maximum propagation speed of light is 3.0×108 m/s

C. The speed of light propagating in a vacuum is maximum

D. Light year is an astronomical unit of distance

10. When it thunders, you always see the lightning first and then hear the thunder, because ()

A． When it thunders, there is always lightning first, followed by thunder.

B. When thunder occurs, although lightning and thunder occur at the same time, the human ear responds slower than the human eye.

C. When thunder occurs, although lightning and thunder occur at the same time, the propagation speed of light is greater than the propagation speed of sound.

D. When thunder occurs, the distance between the place where the lightning occurs and the place where the thunder occurs is different from the person.

PPT on linear propagation of light, part 2: Comprehensive practice of regular methods

11． Which of the following statements about sound and light is correct ()

A． The propagation of sound and light requires a medium

B. The propagation of sound requires a medium, and the propagation of light does not require a medium.

C. The speed of light is the same as the speed of sound

D. The propagation speed of light in air is 340 m/s

12. The following description is inconsistent with the scene in Figure 4-1-5 ()

13. At a sports meeting, if you are the finish timer, do you start timing when you see smoke from the starting gun, or do you start timing when you hear the sound of a gunshot ()

A． Start timing when you see smoke coming from the gun because you can see the smoke clearly

B. Start timing when you hear the gunshot, because the gunshot can be heard clearly

C. Start timing when you see smoke coming from the gun because the speed of light is much greater than the speed of sound

D. Start timing when you see smoke coming from the gun, because light does not take time to travel

14. As shown in Figure 4-1-6, the frog in the dry well "sits at the bottom of the well and looks at the sky" (point O is the position of the frog's eyes). In Figure 4-1-7, the correct observation range of the frog through the wellhead is ()

15. In the comprehensive practical activity of exploring light spots under the shade of trees, in order to study the impact of the size of the holes on the shape of the light spots, Xiaohua designed four types of card A with holes of different shapes, and covered the A with another card B, as shown in the figure As shown in 4-1-8. Then, move B horizontally in the direction of the arrow from the position shown in the figure, and observe the changes in the shape of the spot. The following are the required ones: ()

16． The ancient working people made many great inventions, and the "sundial" is one of them. As shown in Figure 4-1-9, the sundial is a timekeeping tool that uses the principle of light propagating along ____ in the air.

17． When there is thunder in the summer, Xiao Ming hears the thunder 4 seconds after seeing the lightning. Then the distance from the thunder place to Xiao Ming is _____m. (Suppose the propagation speed of sound in the air is 340 m/s)

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Update Time: 2024-11-17

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

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