speed of light
Matter slows the propagation of light. This topic is part of Physics within Science & Nature. This page currently draws on 10 supporting questions, with answers and bonus facts available below.
speed of light trivia questions
Light travels fastest through what?
Answer: Vacuum
Bonus fact: Matter slows the propagation of light.
The speed of light in vacuum is closest to what?
Answer: 300,000 km/s
Bonus fact: The exact value is 299,792,458 meters per second.
Which symbol commonly represents the speed of light?
Answer: c
Bonus fact: The constant c appears throughout relativity and electromagnetism.
Classical mechanics works best for objects moving how compared with the speed of light?
Answer: Much slower than the speed of light
Bonus fact: At very high speeds, special relativity replaces Newtonian mechanics as the more accurate description.
A black hole has gravity so strong that even what cannot escape beyond its event horizon?
Answer: Light
Bonus fact: The escape speed inside the event horizon exceeds the speed of light.
Special relativity says the speed of what is constant for all inertial observers?
Answer: Light
Bonus fact: The speed of light in vacuum is invariant.
Radar distance is calculated mainly from the time it takes a signal to do what?
Answer: Travel to the target and back
Bonus fact: Radio waves travel near the speed of light.
The SI meter is directly defined by fixing the numerical value of which physical constant?
Answer: Speed of light in vacuum
Bonus fact: The speed of light in vacuum is fixed at exactly 299,792,458 meters per second.
In a vacuum, at what speed do photons travel?
Answer: The speed of light
Bonus fact: All photons travel at c in vacuum, about 299,792 kilometers per second.
Relativistic jets are narrow streams of matter moving at speeds close to what?
Answer: The speed of light
Bonus fact: They are among the most energetic and spectacular structures seen in astrophysics.