What is the speed of light in a vacuum? A. 300,000 kilometers per second. B. 30,000 kilometers per second. C. 3,000 kilometers per second. D. 300 kilometers per second. 相关知识点: 试题来源: 解析 A。解析:真空中的光速是 30 万千米每秒。选项 B、C、D 的速度都不正确。
What is the speed of light in a vacuum? A. 300,000 kilometers per second. B. 200,000 kilometers per second. C. 100,000 kilometers per second. D. 400,000 kilometers per second. 相关知识点: 试题来源: 解析 A。本题考查科普知识,光在真空中的速度是 30 万千米每秒。其他选项的速度都...
What is the speed of light in a vacuum? A. 300,000 kilometers per second B. 200,000 kilometers per second C. 100,000 kilometers per second D. 50,000 kilometers per second 相关知识点: 试题来源: 解析 A。真空中光速是 30 万千米每秒。其他选项速度均不对。
百度试题 结果1 题目What is the speed of light in a vacuum? A. 299,792 kilometers per second B. 299,792 meters per second C. 299,792 miles per hour D. 299,792 feet per second 相关知识点: 试题来源: 解析 B 反馈 收藏
题目What is the speed of light? A. 300,000 kilometers per second. B. 300,000 meters per second. C. 30,000 kilometers per second. D. 30,000 meters per second. 相关知识点: 试题来源: 解析 A。光的速度是 30 万千米每秒,所以答案是 A。B、C、D 选项的速度都不对。
百度试题 结果1 题目What is the speed of light in a vacuum?相关知识点: 试题来源: 解析 299,792,458 meters per second 反馈 收藏
Light is faster than anything else in the known universe, though its speed can change depending on what it's passing through.
Little wonder then why the speed of light is the metric used to determine astronomical distances. When we say a star like Proxima Centauri is 4.25 light years away, we are saying that it would take – traveling at a constant speed of 1.07 billion km per hour (670,616,629 mph) – about...
C. The speed of light in a vacuum is constant. D. Length contraction does not occur. 相关知识点: 试题来源: 解析 C。解析:特殊相对论的关键概念之一是真空中的光速是恒定的,对所有观察者来说都是相同的,无论他们的运动状态如何。A 选项错误,光速不是可变的;B 选项错误,时间对于运动的物体来说是变...
How many meters does light travel in a second? The speed of light is 3.00 x 10^8 m/s. How fast is this in miles per hour (miles/h)? What is the speed of light measured in? What is the speed of light squared? What if the speed of light was not constant?