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3. Who determined the exact speed of light?

a. Albert Einstein

@ No. Albert Michelson determined the exact speed of light.  

*b. Albert Michelson

@ Yes. Albert Michelson won the Nobel Prize for Physics for determining the exact speed of light.

c. Thomas Edison

@ No, Thomas Edison did not determine the exact speed of light.

d. Guglielmo Marconi

@ No. Marconi did not discover the exact speed of light, but he did win the Nobel Prize for Physics for his work with radio waves.