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Why is the rate of electric field establishment = the speed of light?
Just like the current conduction rate, as soon as the electric field is formed, all charged objects in the electric field are subjected to the electric field force, and it does not take time
Is the speed of electric field the speed of light?
Light is an electromagnetic wave that can be seen by human beings. The speed of electromagnetic field in vacuum is the speed of light. Photons do not exist. Believe it or not, the propagation of electromagnetic field is that the wave source excites the vacuum particles and makes them vibrate and propagate from near to far. The so-called photons are just a kind of illusion. If you admit the existence of photons, then
Knowledge about the unit of length in kilometers?
1km = 1000m = 100000cm, kilometer is also called kilometer, the unit of length, which is usually used to measure the distance between two places. It is an international standard unit of length, the symbol km, which comes from the English of kilometre. Kilometre is thousand, metre is metre, and kilometer is kilometre
RELATED INFORMATIONS
- 1. The kilometer is a longer unit of length. Is that right?
- 2. How many kilometers is 16 light years? Please gods
- 3. It is about 4 light-years away from the sun, equivalent to () km
- 4. One light year is about a few kilometers
- 5. According to astronomer's measurement, besides the sun, our nearest star is the nearest neighbor star with 4.2 light years According to astronomer's measurement, our nearest star, except the sun, is a 4.2 light-year neighbor 1. Light year is a unit of length. How many meters is one light year equal to? 2. How many years will it take for an astronaut to leave the earth in a spaceship with a speed of 1000 meters per second? 3. What is the inspiration of the above calculation results for you to understand the universe
- 6. A star is about 400 million light-years away from the sun, equivalent to about how many kilometers
- 7. It is about 4 light-years away from the sun, which is equivalent to about km
- 8. 1 light year = () km
- 9. It takes 4.3 light years for the light from a neighboring star to reach the earth. How many meters is it from the earth?
- 10. The speed of light is 300000 kilometers per second. A year's journey of light is called light year. How many thousands of miles is a light year?
- 11. Why is the speed of electric current the speed of light? Our teacher said that there is free moving charge in the wire, so the light goes on as soon as the power is turned on, just like the water stored in the water pipe Is this a scientific statement? If this is true, the propagation time of electric current needs almost no time. But the speed of electric current is the speed of light. I checked other questions. We said that the essence of electric current is electromagnetic field, and the propagation speed of field is the speed of light What's more, is the formation of electric current really the directional movement of electric charge? Then why is the speed of electric current not the speed of electric charge movement but the speed of electric field propagation? (I know that the speed of electric charge movement is very slow, don't talk about the conclusion, I want to know the reason, ask the big God to answer, don't answer the questions that I don't know.)
- 12. Why is the conduction velocity of electric current equal to the speed of light? Why is the propagation velocity of electric field equal to the speed of light C?
- 13. The propagation speed of electromagnetic wave in vacuum is equal to the speed of light,
- 14. When the speed is equal to the speed of light, time stops; when the speed is higher than the speed of light, time reverses What does this sentence mean? Why do many scientists agree I feel that what he said is that you can also think that it is equal to the speed of light, and time stops because you are so fast that you can't see time going, But beyond the speed of light, time goes backwards, which I can't imagine why Who can explain it scientifically~
- 15. Is Shenzhou-5 more than one light-year away from the earth in space
- 16. 10 to the nth power = 5, what is n equal to
- 17. What is the power of minus one fifth to the power of 2009 plus five to the power of 2010
- 18. The power of (125 / 27) - 2 / 3 help
- 19. Given that the m-th power of a is 2, the n-th power of a is 5, and the p-th power of a is - 2, find the value of 5m + 2n-3p power of A
- 20. The fourth power of x plus 4 factoring? How to do? Gods help