What is the speed of light in a vacuum? A. 300,000 kilometers per second. B. 3,000 kilometers per second. C. 30,000 kilometers per second. D. 300 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。选项 B、C、D 数值错误。
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。
speed of light - the speed at which light travels in a vacuum; the constancy and universality of the speed of light is recognized by defining it to be exactly 299,792,458 meters per second light speed, c constant - a number representing a quantity assumed to have a fixed value in a sp...
In the intrinsic coordinate system, the time required for light emitted by a point light source at a certain moment to propagate to a particle is equal to the time required for the photon shell expanded from the light spot created at that moment to intersect with the particle. This time is...
Ifμorepresents the magnetic permeability constant in free space andΣois the permitivity in vacuum, and C the speed of light in vacuum , then View Solution For a given medium , the speed of light and the polarising angle are V andiprespectively. Then from Brewster's law [C is the speed...
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
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 in a vacuum is generally held to travel at an absolute speed, but light traveling through any material can be slowed down. The amount that a material slows down light is called its refractive index. Light bends when coming into contact with particles, which results in a decrease in sp...
Blood samples were collected using a vacuum collection tube containing anticoagulant sodium fluoride and centrifuged on-site within 2 h of collection. Details on the measurement of FPG, 2 h PG and HbA1c have been described in previous publications and insulin concentrations at fasting state were ...
百度试题 结果1 题目The speed of light in a vacuum is approximately: A. 300,000 km/s B. 3,000,000 km/s C. 30,000,000 km/s D. 300,000,000 km/s 相关知识点: 试题来源: 解析 D 反馈 收藏