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how SPEED OF LIGHT measured?
5 Answers
- 2 decades ago
Thanks to the advancement in technology, we can measure the speed of light in many ways now.
But here is an interesting method used long before, which is my personal favourite.
In 1849, Armand Fizeau sent a beam of light through a rotating wheel with a large number of teeth around the outside. A mirror on the other side reflected the beam each time a gap appeared in the path of the light. Fizeau realized that if the wheel rotated fast enough, the return beam would be blocked by the next tooth as it came around. So he varied the speed of the wheel until the reflected beam disappeared, performed a bit of math, and got a result of 315,000 km/second (195,732 miles/second)—certainly in the ballpark.
Visit the link below and read on to get more interesting details on this. :-)
Source(s): http://itotd.com/articles/284/ - 2 decades ago
With high powered lazers in a physics lab. Believe it or not, but there are computers sensitive enough to measure photons.
Source(s): My college physics teacher at CSUF has very expensive, high-powered lazers and detection equipment in his lab, and he uses this technique to measure atmospheric pollutants. Computer electrodes do all the measuring - we pretty much just push a button and the computerized lazer, mirrors, and detectors do all the work. - How do you think about the answers? You can sign in to vote the answer.
