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Railways PYQCBT 1 2016

RRB NTPC · Question 23

In which year did Ole Romer measure the speed of light for the first time in history? A. 1776 B. 1676 C. 1876 D. 1867

  1. A

  2. D

  3. B

  4. C

Show answer & explanation

Answer: (C) B

Explanation

In 1676 the Danish astronomer Ole Rømer first showed that light travels at a finite speed, by timing the eclipses of Jupiter's moon Io, which happened earlier or later depending on Earth's distance from Jupiter.