Dr. read it. Elephant. Daniel Arnett
It’s the first thing every person sees at birth, rhyming with “not”, it’s actually nothing, but it means everything for life, and Goethe (1749-1832) allegedly demanded more of it on his deathbed: the light. Pythagoras (570-510 B.C.) and Euclid (about 300 B.C.) postulated that it emanated from the eye as a hot optical ray propelled backwards by the objects examined. However, in ancient times there was already an opinion that the brightness comes from a light source.
“Light. Story” is the title of the recently published book by French physicist Serge Harroche (76). Ten years ago he was awarded the Nobel Prize for his findings on the interaction between light and matter. Here he provides richly anecdotal accounts of his life as a researcher and infuses the history of research in it with Lots of facts.Harush writes: “Science is an indivisible unit, and discoveries are mostly made by combining information gathered in different fields of science.”
Physicists, chemists, and biologists have made significant contributions to the knowledge of light today over the past four centuries. It all began with the Italian polymath Galileo Galilei (1564-1642), who wanted to calculate the speed of light with an assistant and two lamps on a Tuscan hill: as soon as Galileo’s assistant saw a light signal, he was supposed to light it back – the speed can be measured from the delay. Today we know that at a short distance it does not exceed a millionth of a second, and therefore it is imperceptible to the naked eye.
The French physicist Hippolyte Veseau (1819-1896) did better in 1849. “Fiseau no longer carries out his experiment between a Tuscan hill, but between his home in Soursnes and his parents’ apartment in Montmartre, 8.6 kilometers away,” says Harroch. He improved Galileo’s method by replacing the human assistant with a mirror that reflected light directly back. Fizeau calculates a speed of 315,000 kilometers per second.
It is very close to today’s official figure of 299,792 kilometers per second. “This was the first modern mechanical watch that made it possible to determine the speed of light,” Harroch wrote. On the contrary, today’s laser light offers possibilities for methods of timekeeping that early watchmakers could not have imagined. “The story doesn’t end here, it continues,” Harouche says. It will provide us with new devices that will take on more unusual and amazing shapes than can be imagined today.
Serge Harush, «Noor. Story », Klit Kuta
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