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Tran Nguyen Quoc Khang

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536. Gordon Bennett 1
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538. Tran Nguyen Quoc Khang 1
539. Nguyễn Tuấn 1
540. Sofija Vrebac 1
last 3 solved tasks
Remove 7 letters from this sequence (USPAITRKIOTDEISOM) to reveal a familiar English word.

Armand-Hippolyte-Louis Fizeau

Died 18 Sep 1896 at age 76 (born 23 Sep 1819). French physicist who was the first to measure the speed of light successfully without using astronomical calculations (1849). Fizeau sent a narrow beam of light between gear teeth on the edge of a rotating wheel. The beam then traveled to a mirror 8 km/5 mi away and returned to the wheel where, if the spin were fast enough, a tooth would block the light. Knowing this time from the rotational speed of the wheel, and the mirror's distance, Fizeau directly measured the speed of light. He also found that light travels faster in air than in water, which confirmed the wave theory of light, and that the motion of a star affects the position of the lines in its spectrum. With Jean Foucault, he proved the wave nature of the Sun's heat rays by showing their interference (1847).

Ponderings Collection 04

Why is it called a "building" when it is already built?
Why do they call them "apartments" when they are all stuck together?
Why is there an expiration date on SOUR cream?
If you keep trying to prove Murphy's Law, will something keep going wrong?
Why does flammable and inflammable mean the same thing?
How can someone "draw a blank"?
Shouldn't there be a shorter word for "monosyllabic"?
Why is the word "abbreviate" so long?
Why did kamikaze pilots wear helmets?
What is another word for "thesaurus"?
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