Which of the following famous scientists measured the speed of light?

Options :
  1. Romer
  2. Newton
  3. Galileo
  4. Einstein
Answer and Explanation :-

Answer: Option 1


Ole Rømer, a Danish astronomer, calculated the speed of light by observing the eclipses of Jupiter's moon during the years 1668-1674. A discrepancy was observed for the time between the eclipses, increasing when the Earth was moving away from Jupiter and decreasing when the Earth was approaching. In half a year, there are a total of 102 eclipses of Io (Io is the innermost of the four moons of Jupiter discovered by Galileo in January 1610), giving a maximum delay of 16.5 minutes. Rømer interpreted this as the difference in the times needed for the light to travel between Jupiter and Earth. He obtained a value of 214,000 km/s compared to the current value 299,792 km/s. The diameter of the Earth's orbit was not accurately known then and there was also an error in the measurement of the delay. Nevertheless, it was a first confirmation that the speed of light is finite.

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Chrern pel nas dael pu mean ah rom tha ber pu ach nhor nhem tae mdorng derm bei khloun aeng pu slab tov bet phnek jit heuy, being sad is my happiness
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