Who was the first scientist to successfully measure the speed of light using observations of Jupiter's moon Io?
Correct answer: C. Ole Rømer
- A. Galileo Galilei
- B. Isaac Newton
- C. Ole Rømer
- D. Albert Einstein
Explanation
Ole Rømer estimated the speed of light in 1676 by observing delays in the eclipses of Jupiter's moon Io as Earth moved in its orbit. Galileo studied the possibility earlier but could not measure light's speed successfully.
Last updated
About Inventions and Discoveries
Inventions and Discoveries covers the people, dates, principles and practical uses behind developments such as the wheel, printing press, telephone, electricity, radio, computer, internet, vaccines and space technology. It distinguishes an invention, which creates a device or process, from a discovery, which identifies something already present in nature.
Practise Inventions and Discoveries
286 free Inventions and Discoveries MCQs from General Knowledge, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask General Knowledge questions like this
General Knowledge is on 58 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.