Multiple choice general knowledge science & technology

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 Romer first measured the speed of light in 1676 by observing the timing of Jupiter's moon Io. He noticed that the observed period of Io's orbit varied depending on Earth's distance from Jupiter, concluding that light has a finite speed. Einstein and Newton are incorrect - they worked on theoretical aspects of light, not measurement. Galileo attempted to measure light speed but failed.

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