密度無限大代表無解？物理學家打臉課本知識、破解愛因斯坦理論 Dr.Michio Kaku Answers Physics Questions From Twitter｜名人專業問答｜GQ Taiwan

i read one science fiction story where the bad guy gets thrown into a black hole and he screams in fact he screams forever i'm dr michio kaku professor of theoretical physics and best-selling author of the god equation and i'm here today to answer your questions on twitter this is physics support [Music] cal is not a cow ask y'all why do atoms want to bond so much why don't they just stay single you aren't missing anything atoms want to bond together that's why we have molecules that's why we have people dna our universe is based on atoms which like to bond with each other the electron vibrates back and forth binding them together and that's why we have molecules that's why we have you you are a consequence of the fact that electrons are shared between different atoms using the laws of the quantum theory deborah morozak ask the question what's your favorite law of physics mine is momentum conservation well my favorite law of physics is the equivalence of matter and energy einstein's equation e equals m c squared this is why the sun shines it's why the stars twinkle it's what lights up the universe we like to think that matter and energy are totally different things how can a rock turn into energy however if that rock is uranium and that energy is the fireball of a nuclear bomb you realize that matter and energy are two sides of the same coin matter energy is one unit and they can flip into each other under certain circumstances like in the heart of a star sean harris at infosec hotspot asks does anyone know of people like michio kaku that can explain string theory like he does for people like me and i'm not a genius well i am michio kaku and i'd be glad to answer that question first of all most textbooks say that an electron is a dot particles that we see in our atom smashers are dots but if i had a super microscope i can see that that dot is actually a rubber band from a distance this rubber band looks like a dot close up you see that it's a vibrating string now this rubber band can vibrate in many different modes each mode can be called a particle so for example this might be an electron but if you twirl it in a different way it becomes a quark and if you twirl it this way you have to give it a different name we call it a neutrino now how many ways can one string vibrate the answer is obvious an infinite number of vibrations on the same string and so we think that all the subatomic particles of the universe the quarks the neutrinos the mesons the protons and neutrons there's a galaxy of these particles they're nothing but musical notes on a tiny rubber band a rubber band so small that it looks like a dot so what is physics that we had to struggle with in high school physics is the harmonies the harmonies of vibrating strings physics tells us how these vibrations move what is chemistry chemistry is when these strings bump into each other and form molecules alex add kuransk skong asked what is a quark what is omg yeah it's a oh my god we think that inside the proton there are three quarks subatomic particles that make up the protons and neutrons which in turn make up our universe here's a question from rick at sojourner99 we live in four dimensions but can see three how many dimensions are there einstein says we live in a four dimensional world we can go forward backward left right up down and the fourth dimension is time but now we're beyond einstein and we have to go beyond four dimensions to perhaps let's say 10 11 dimensions but where are these other dimensions we think they have curled up they're so small that you cannot enter them but perhaps we can feel their effects and where is this other dimension it is off the plane of your universe perhaps a parallel universe hovering right above your universe in another dimension that we cannot see or touch but perhaps there's a gateway connecting them that gateway is the wormhole it was einstein himself in 1935 who introduced the concept of a wormhole a gateway between higher dimensional universes well the next question comes from jay mozak who asked the quantum universe was einstein wrong about his theory of relativity yes and no there's a famous quote where einstein said the more successful the quantum theory gets the sillier it looks he thought that atomic physics that is quantum mechanics was incomplete when the nobel prize was given to people like heisenberg he said yes give them the nobel prize they're on to something and so weinstein had reservations about the quantum theory as the final theory he thought there had to be a higher theory a theory even beyond the quantum theory so einstein was not totally incorrect obi would shaina lang ask what is the god equation well einstein spent the last 30 years of his life chasing after the god equation an equation perhaps no more than one inch long that would allow us to quote read the mind of god a theory that would unite the two branches of physics on one hand we have the theory of the big general relativity black holes big bangs and the theory of the small quantum theory atomic physics how can you unite these two into one theory at the present time these two theories hate each other they're based on different mathematics different principles different concepts and yet we believe in our heart of hearts there has to be a master theory out there the holy grail of physics and that we think is the god equation the leading and only candidate for that is string theory and by the way if you ever find the god equation tell me first we'll split the nobel prize money together you and me here's a question from princeton university press and that is who is your favorite physicist 46.2 percent said that einstein was their favorite physicist 53.8 percent thought that richard feynman was their favorite physicist my favorite physicist is isaac newton he asked the question for the ages if an apple falls does the moon also fall and he realized that he didn't have the mathematics to calculate a falling moon so what did he do he invented his own mathematics called calculus and the theory was one of the greatest theories of all time newton's law of gravity and so during the black plague of 1666 one of the greatest minds in history went from superstition and thrust us into the age of mechanics the industrial revolution he changed world history you can't beat that einstein is way up there so is richard feynman but isaac newton tops them all the next question comes from hassan babanji who asks can light bend around corners if yes or no give one reason yes light can bend around corners in fact that's why we have glass inside your glasses when light goes into glass it slows down slightly because it slows down it deviates from a straight line and that's why we have your glasses telescopes microscopes because glass bends light also gravity can bend light as einstein showed us and we can actually see the bending of light as it goes around a galaxy then the next question is can you bend light completely around an object so the object becomes invisible and the answer is yes it's well within the laws of physics that if you could govern the atomic structure of glass then light would bend in a way such that it would completely go around an object so anything inside that object becomes invisible one day we will build a meta material out of nanotechnology that will bend visible light so that anything inside that capsule will become invisible harry potter watch out boxy fan 2001 asks how do black holes distort time and what the hell does that mean time does not beat uniformly throughout the universe clocks on the moon beat a little bit faster than clocks on the planet earth on jupiter clock speed slower than on the planet earth the heavier the planet the slower time beats this means that on a star like the sun time beats even slower and the ultimate star of course is the black hole the remnants of a dying star we think that at the very center of the black hole time stops what does that mean if you were to fall into a black hole from your point of view it would take perhaps a few minutes let's say to fall through a black hole depending upon where you started from your watch says that you went right through to the center of the black hole but from outside somebody with a telescope looking at you from outer space would see you frozen in time slowly going into the black hole because time beats at a different rate from the outside and the inside get your head around this time can beat at different rates at different points in the universe she'll be asked like how are black holes and infinite density even possible like how does something get so dense that it collapses on itself i wanna know we know that if i take a gigantic star or galaxy and compress it its gravity is so great that nothing known to science can escape the clutches of gravity so light itself is trapped by the black hole and according to textbooks it collapses to a point of infinite density let's be real about this there's no such thing as infinite density we just say that in textbooks because we don't know what happens when a star collapses into a tiny dot infinite density is a shorthand of saying i don't know we really don't know what happens at the very center of a black hole if you do the mathematics very carefully you realize that the black hole is spinning and spinning stars collapse to a ring they don't collapse to a dot at all and if you fall through the ring the mathematics says that you fall not just to the ring but you fall to the other side to a parallel universe that is on the other side of a black hole there's a white hole everything that falls in gets blown off the other end the village celeb at the village salem here's a question for physics people only i was sitting in the back seat of a bus which was going at 120 kilometers per hour a fly rose from my shoulder and flew right up front and landed on the drivers so does it mean the fly was going faster than the bus let's let newton answer this question and that is velocities can add if you are a bystander looking at the bus and the fly from outside you would say yes the velocity of the fly is the velocity of the bus plus the velocity of the fly inside the bus velocities can add now of course if you're inside the bus the fly seems to go at a very slow rate if the bus is really a rocket ship traveling near the speed of light and a fly flies inside the rocket ship apparently breaking the light barrier how's that possible well einstein would say that you cannot add velocities in relativity the fly cannot break the light barrier no matter how fast that rocket is moving no matter how fast that fly is moving you cannot go faster than the speed of light newtonian physics is wrong that means that the two velocities have to be adjusted because of the fact that time inside the rocket has slowed down now this is amazing but it works and this has been measured repeatedly with our particle accelerators and our experiments david h app highwell asked this question what is dark matter can it be touched is it dangerous most of the universe is made out of dark matter dark matter surrounds the milky way galaxy if it wasn't for dark matter the milky way galaxy would have spun out of control and the earth would be flung into outer space can it be touched well no because it would filter right through your fingertips right through the atoms of your body is it dangerous no because it doesn't interact with us and then here's the big question what is it there's a nobel prize out there waiting for that person who can figure out what dark matter is he said hiki tak asks what is the difference between experimental physics and theoretical physics experimental physics engages in reality it does experiments on things you can touch and feel theoretical physics tries to explain how and why that happens einstein did not do experiments on light beams he did not do experiments on stars and galaxies by looking through a telescope einstein work with a pencil and paper that's called theoretical physics and the heavy lifting was done by experimentalists who built the particle accelerators the telescopes and the devices that allowed us to probe into the center of stars and galaxies jihan h asks the question for physicists is adding a cape to your superhero costume enhance your flying abilities i wish that there was a magic cape that we can suddenly put on and soar like superman it doesn't work that way birds fly not because they flap their wings birds fly because of the shape of their wings the shape of the wings is an airfoil a tear shape for the bird's wing air flows over the tear and under the tear creating a partial vacuum on top of the wing that partial vacuum means that air has to flow upwards to keep that wing afloat it is bernoulli's principle so it's not the cape it's the shape of the wing that is the key to flying these are the questions for today and remember there's no such thing as a dumb question years ago when a young boy was 16 years of age he asked a dumb question can you outrace a light beam that 16 year old boy was albert einstein and that dumb question opened up the universe for physicists and for you and me thanks for watching physics support

Channel: GQ Taiwan

Views: 1,291,851

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Id: MWKN_IkM43s

Length: 16min 19sec (979 seconds)

Published: Sat Aug 07 2021