Einstein was not only a great scientist but a great visionary, a great compaigner of world peace and democracy also. Give reasoned answer in 120-150 words hints are 1. Published general theory of relativity 2. work hailed as scientific revolution 3. recieved noble prize 4. Letter to American President regarding destruction that atom bomb could cause 5. wrote public missive to United Nations 6. advocated for world government. please please please please please answer it
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For three centuries, Sir Isaac Newton and his laws of motion and gravity were the final word in physics dogma. Then along came Albert Einstein with a newfangled and revolutionary theory of general relativity that turned Newton on his head. Rather than perceiving space and time as fixed entities as Newton did, Einstein imagined space and time as dynamic, dependent on frames of reference. And he formulated the equations to prove it.
Fast-forward to the 21st century and Einstein’s fingerprints are all over the modern world: Photoelectric cells, television, nuclear power, space travel and semiconductors all bear his signature in some way. Even the global positioning system (GPS) people tap into on their smartphones relies on Einstein’s theory of general relativity to function accurately.
Since 1915, when Einstein published his first paper on general relativity, his theory has guided many of the major developments in physics. “In cosmology, relativity gave us the framework to study the universe as a whole and all of our modern theories of cosmology are based on it,” said Gary Horowitz, a professor in UC Santa Barbara’s Department of Physics. “In astrophysics, relativity predicts gravitational lensing, the bending of light that allows us to see very distant objects more clearly because of the theory.
To accomplish this great feat, LIGO used a chirp from two massive black holes that merged more than one billion years ago in a distant galaxy. The signal was minuscule, and so weak that until now no equipment was sensitive enough to detect it. The LIGO team, which worked for more than two decades to refine its instrumentation, was able to achieve the sensitivity to measure the mind-bogglingly small movements in masses separated by 4 kilometers produced by the gravitational wave, which passed in less than one-tenth of a second.
“The discovery is profound not only because it confirms a large part of Einstein’s theory of relativity, but it also tells us many things in astrophysics that we actually didn’t know,” said astrophysicist Lars Bildsten, the director of UCSB’s Kavli Institute for Theoretical Physics.
The largest black hole of this type ever observed in the disc of our galaxy was about 15 times the mass of our sun, Bildsten noted. “The two black holes that created the observed gravitational wave were each nearly 30 times the mass of the sun,” he explained. “We had no idea that normal stellar evolution could make black holes that large. So that alone was an astronomical discovery.”
Gravitational waves provide an entirely new medium for exploration and offer novel ways for physicists to probe the universe, opening up whole new cosmic frontiers.
“Parts of the universe are opaque to electromagnetic waves — like light and its longer and shorter wavelengths — so we’ve never been able to see them directly,” Horowitz said. “Gravitational waves can be used to tell us about the universe and areas we haven’t been able to see before.”
Gravitational waves — a consequence of the theory of general relativity — stand poised to take their place next to another great theory Einstein helped usher into the 20th century: quantum mechanics. Although somewhat incompatible, both relativity and quantum mechanics underpin theoretical physics 100 years later. In fact, a deeper understanding of gravitational waves may one day help guide the discovery of a more fundamental theory that reconciles the two.
“We have good reason to believe general relativity is not a complete theory and, in particular, that it’s going to break down in the context of describing black holes,” said UCSB physics professor Steve Giddings. “That’s very much an important problem in physics today.
“The direct observation of gravitational waves from colliding black holes really constrains the possible departures from general relativity that we know are there and limits where modifications can be made,” he continued. “But the discovery is still spectacular and its announcement was one of those moments in science that you live for.”
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A truly beautiful mind, Class 9 English Explanation, summary, Question Answers
By Ruchika Gupta
CBSE class 9 English Lesson "A truly beautiful mind"
CBSE class 9 English Lesson - A truly beautiful mind. Detailed explanation of the lesson along with meanings of the difficult words Also, the explanation is followed by a Summary of the lesson. All the exercises and Question and Answers given at the back of the lesson have been covered
CBSE Class 9 Beehive Lesson 4 - A Truly Beautiful Mind
Introduction to the lesson
This chapter is about Albert Einstein. He was a great scientist. The title of the chapter ‘A Truly Beautiful Mind’ refers to Albert Einstein. This is a short biography of his where some of his qualities have been highlighted – Albert’s interest in Mathematics and Physics and also his humanitarian attribute.The title - ‘A Truly Beautiful Mind’ makes one wonder that how can a scientist’s mind be beautiful. It is so, because in this lesson we come across another aspect of Einstein. He was a humanitarian. He advocated world peace, non - violence and that is why the title refers to him as a truly beautiful mind.
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Lesson and Explanation
ALBERT Einstein was born on 14 March 1879 in the German city of Ulm, without any indication that he was destined for greatness.
destined: fate, a predetermined set of events that has to happen in the future.
Albert Einstein was born on 14th March 1879. He was born in a city named Ulm in Germany. When he was a child, no one could predict that one day he would become a great scientist. He was like all the other children.