Subject :IGK Class : Class 6
He was an English physicst whose most notable achievements were in the precise measurement of time and the determination of the speed of light. He was the first to determine the speed of light using a laboratory apparatus? Who is he?
AIsaac Newton
BLouis Essen
CB. Halt
DNone of these
Ans 1:
Class : Class 8
The answer is b Louis Essen