1. May I ask how far light can travel in 1 second in a vacuum (in meters)?
2. May I ask approximately how fast light travels in air (in meters)?
3. May I ask the distance between Altair and Vega (in light-years)?
4. What are the three primary colors of light?
5. What is sublimation?
6. What is deposition?
7. What material is used to make fuses?
8. The Earth is a huge what?
9. Who discovered the magnetic effect?
10. Who invented the telephone?
11. How are electromagnetic waves generated?
12. Do electromagnetic waves need a medium to propagate?
Question 1 was answered correctly by Qingcheng@Canny@Windchake@Shang. Questions 5 and 6 were answered correctly by Qingcheng@Shenyue. Question 7 was answered correctly by Perfect@XiaopingUser. Question 4 was answered correctly by Qingcheng@Shenyue. Questions 2, 8, 10, 11, and 12 were answered correctly by Huangfu Chaoyun. Question 9 was answered correctly by Perfect@Melody of Love.
Physics A-level, guess! Before answering, please open your physics book and check! No need to use Baidu.
Replies (26)
1. The speed of light in a vacuum is close to 3*10^8 meters/second. 2. In air, it is close to 2.9*10^8 meters/second. 3. Forgot. 4. Red, green, blue. 5. Changes directly from solid to gas. 6. Changes directly from gas to solid. 7. Made from low-melting-point alloy, can't type the characters. 8. Magnet. 9. Don't remember. 10. Bell. 11. Generated by electricity. 12. Not needed...
3. Approximately 3 to the power of 8 4. Red, blue, cyan 5. An object changes directly from solid to gas 6. An object changes directly from gas to solid 8. Ellipse 9. Faraday 10. Bell 11. No
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