How was the speed of light measured in a precise way?

A. by timing how long it takes for an assistant far away to turn on a lantern after the scientist turns one on

B. by watching for eclipses

C. by timing the speed of falling meteorites

D. by using rotating mirrors to measure light's round trip travel to a distant mountain

:O :/

Question

How was the speed of light measured in a precise way?

A.       by timing how long it takes for an assistant far away to turn on a lantern after the scientist turns one on

B.       by watching for eclipses

C.       by timing the speed of falling meteorites

D.       by using rotating mirrors to measure light's round trip travel to a distant mountain

:O :/

michele_laino · Answer

please wait a moment, since a student asked me for help

anonymous · Answer

ok!! :D

michele_laino · Answer

please wait, I'm searching for your answer into my textbook

anonymous · Answer

ok!!

michele_laino · Answer

here is my answer:
In the past 1927, the rotant mirros method has been used by Michelson between Mount Wilson and Mount S. Antonio in California. The distance between those mountains is 35 Km

michele_laino · Answer

rotating mirrors*

anonymous · Answer

ohh so it should be choice D? 

what an interesting way to measure light! :O

michele_laino · Answer

yes!

michele_laino · Answer

here is the value of c which Michelson found:
$$\Large  c = \left( {298,000 \pm 500} \right)Km/\sec $$

anonymous · Answer

oh yay!! thank you!! :D

and ooh :O

michele_laino · Answer

thank you!! :)