![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
The propagation of physical light 1. The phenomenon of solar eclipse is explained by the () principle of light 2. The light from the sun will reach the earth in about 8 minutes. Please calculate the distance between the sun and the earth, which is about () M 3. The principle of pinhole imaging is () 4. Pinhole imaging is formed by ()
1、 Linear propagation
2、 144 million
3、 Light travels in a straight line
4、 Light travels in a straight line
Note: there is a condition for light to propagate along a straight line in the same homogeneous medium
RELATED INFORMATIONS
- 1. The propagation speed of sound and light in the air is about 340m / s and 3 × 108m / s respectively. In the 100 meter race, if the timekeeper starts to count when he hears the starting gun, the time of counting is longer than the actual running time of the athlete______ (choose "more" or "less")______ s．
- 2. What are the experiments of analogy in physics
- 3. "When we encounter bad things, we should consider the good things contained in them, and also consider the worse situation." in fact, good things and bad things can often be transformed into a contradictory unity,
- 4. When we encounter bad things, we should consider the good things and the worse When we_________ We should__________ At the same time__________ .
- 5. An example of "a blessing in disguise" in life?
- 6. Exercise: many things are not as bad as we think. As long as we are willing to use our brains, bad things can often turn into good things. In life, you must also meet A lot of things are not as bad as we think. & nbsp; & nbsp; as long as you are willing to use your brain, bad things can often turn into good things. In life, you must also encounter such things. Please write them down and share them with us!
- 7. Idioms from a blessing in disguise No, it's just an empty one
- 8. What does the story of a blessing in disguise tell us
- 9. Is a blessing in disguise a good thing or a bad thing
- 10. What's the difference between energy transfer and transformation
- 11. The rainbow appears in the sky after the rain. It's light______ The propagation speed of different colors of light in the air is different______ If the wavelengths of red, orange, yellow, green, blue, indigo and purple light decrease in turn, the light with the highest frequency is the one with the highest frequency______ Color light
- 12. How to use the control variable method to get the experiment?
- 13. Now I'm in the second year of junior high school. I want to buy a physics book. Please introduce it to me Such as the title, recommend good I give bonus points!
- 14. How much does a physics book weigh And the weight of a desk, the weight of an apple
- 15. What is the difference between the control test method and the control variable method How to choose? Is there a difference between doing it at the same time and not at the same time?
- 16. On the experiment of "control variable method"
- 17. What are the control variables of physics experiment in junior high school Let's give examples instead of big discussions. Let's name each one
- 18. The control variable method is used in those experiments in junior high school physics learning
- 19. 8. The Chang'e-1 lunar exploration satellite developed by our country runs along the elliptical orbit with the near moon point and the far moon point. When the satellite moves from the near moon point to the far moon point, the satellite () increases () decreases (both filled with "kinetic energy" or "gravitational potential energy")
- 20. If the two bulbs of "220 V & nbsp; 25W" and "220 V & nbsp; 40W" are connected in parallel to the 220 V circuit first, and then connected in series to the same circuit, then () A. The total power consumption of two lamps connected in parallel is greater than that in series D. the total power consumption of two lamps connected in series is greater than that in parallel