Multiple choice general knowledge

The velocity of light was first measured by:

  1. Einstein

  2. Newton

  3. Romer

  4. Galileo
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ole Rømer (Romer) first demonstrated that light travels at a finite speed in 1676 by observing the timing of Jupiter's moon eclipses, noticing they occurred earlier or later depending on Earth's distance from Jupiter. Einstein developed relativity theory much later, and Newton studied light but didn't measure its speed.

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