Help make Alexa smarter on Alexa Answers. Sign in with Amazon

Science

How is light speed measured?

2

The speed of light in a vacuum is 299,792,458 metres per second. A method of measuring the speed of light is to measure the time needed for light to travel to a mirror at a known distance and back using an oscilloscope.

{{ relativeTimeResolver(1585796747134) }}

LIVE
points 119
Rating

The currently most accurate method of measuring the speed of light is using laser and it is constant in vacuum at exactly 299,792,458 metres per second.

{{ relativeTimeResolver(1569277452898) }}

LIVE
points 239
Rating

Similar questions
Join Alexa Answers

Help make Alexa smarter and share your knowledge with the world

LEARN MORE

Join Alexa Answers

Help make Alexa smarter and share your knowledge with the world

LEARN MORE