The Weird Quantum World (11 of 15)
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- เผยแพร่เมื่อ 29 ก.พ. 2008
- Episode 11 of In Search of Giants: Dr Brian Cox takes us on a journey through the history of particle physics. In this episode we learn how Einstein's explanation of the photoelectric effect was one of the first steps towards a quantum mechanical view of the universe. Brian and other scientists explain some of the strange implications of living in a quantum world.
This film is part of a series originally broadcast on Teachers' TV (www.teachers.tv/video/23645).
The series was made with the support of The Science and Technology Facilities Council (www.scitech.ac.uk).
www.lhc.ac.uk - Official UK LHC website for public and schools.
www.particledetectives.net - School resources on the LHC, how science works and particle physics.
Films produced and directed by Alom Shaha (www.labreporter.com).
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Uncertainty is only a definition, the thing being uncertain does not have understand it like being uncertain, or even be uncertain. We only define it as such out of the observation of Newton's Laws, and that's exactly why we conceived it as being uncertain as opposed to predictable.
Classic world, quantum world, macro and micro worlds.. after all, these are all layers of Reality we live in. Reality in the face if this cosmic quantum structure called "Universe". Everything is interconnected, because it is build upon one another, all elements in all structures in the entire Universe, which is a cholarchy-based structure.. It is all so mesmerizing when you think about it! :]
physics type beat
@Shavarnarak Indeed. Mathematics on the whole is a human construct to describe ideas or observed phenomenon. Mathematics can describe and predict observable phenomenon to incredible accuracy - but there's always a hint of uncertainty or inaccuracy left over. Are we just finding "best fit" equations for a system that runs closely to, but not necessarily limited to mathematical restriction? We say quantum physics removes the "clockwork" aspect of nature, but we're still trying to write it down.
its true.
the double slit experiment is my favourite example - it goes against everything we think of at a macro level
quantum level physics bears very little relation to how our life sized world functions
for instance, particles themselves are not subject to the same forces we are subjected to
our atmosphere does absorb some electromagnetic radiation(light). so most gamma rays or x-rays will be absorbed, as they are less common and only emitted by fusion in the suns core. there are different wavelengths because every photon has a certain amount of energy. E = hc/wavelength, where h is planck's constant and c is the speed of light. since the top two variables are constants, the wavelength and energy of a photon are directly related, which is why there are different wavelengths.
Yes it does. E=mc squared states that everything with energy has mass. so since light can do work (Photoelectric effect) it has to have mass. Each second the earth is struck by 2 kg sunlight.
according to E=MC^2 you are right but, photons do not carry any mass. so this equation does not account for photons only for particals with mass.
think about having a friend mess around with you with a laser keychain or laser pointer. it's normally not very bright, but if they catch you by surprise and shine it right in your eye it's blindly bright.
no problem, it get's me thinking. we only see photons that are directly aimed into and reflected into our eyes. which is why we see the moon at night, because the light from the sun is reflected off the moon towards earth; but we don't see photons that go around the earth because they never register into our eyes. with a laser beam, the photons are reflected off objects and eventually travel to our eye. the more photons released, the brighter it appears, because more reach our eye.
Good question!
the higgs boson is what is theorized to give things mass....it explains one particle has mass while another doesn't
i don't know what's causing that pressure. maybe photons cause the atom to release a higgs partical in the opposite direction. that would take account for the action/reaction principle.
But that would mean everything with mass would slowly get light when taking in photons. That would mean the earth is slowly getting lighter and lighter. the effects are minimal and everything consists of billion of atoms so it's not unthinkable.
@Shavarnarak >"quite... rough"
We know so little. Eg about emergence or what's beyond the first 10^-43 seconds, heck we don't even know if the volume of the universe is infinite.
But I think the bigger question is: how far can we go with our evolved brains? I guess we will hit the limitations of the brain WAY before we come close to a complete understanding.
Maybe we can build smart machines to pick it up from there - which could make science documentaries for us, but without the heavy math. ;-)
You may be correct something does not come from nothing. How do you explain the beginning of creation, or intelligent design? From where does the designer come?
yes. the energy of a single photon is influenced by it's wavelength. the shorter the wavelength, the more energy it contains. it must have a certain energy to knock the electrons off the plate. too weak and the electron will not be knocked off. as the wavelength increases, the speed at which the electron is released will increase. an increase in the number of photons being shot at the foil will increase the total intensity of the light, but only increase the number of electons released.
Haven't experiments shown that all the "particles" are actually standing waves?
We have the Lorentz contraction of the geometry of spacetime relative to the mass or energy of an object therefore time must be a measurement and a variable. Could it not be possible that at smaller and smaller distances and shorter and shorter time scales this variable could also be the Hidden Variable of quantum physics? That can explain randomness at the quantum level
By what source of knowledge do you draw this conclusion. Can you think of a better idea to get past the notions of ether and spirits?
@omnissient Well, there is M theory which claims to combine the two together, but its a branch of string theory.
WHERE ARE THE OTHER PARTS !
where's the full video?
Does a photon have mass like other particles?
no...its the length of the wavelength...not the energy
thats not....quite right....why would you be adding kinetic energy twice.....i don't think that's every been done before for one particle
Please explain your evidence.
give it 150 years and this will be laughed at
@womo1975 >"I would love to see all the scientists, atheists, and organized religous members faces when this happens."
That's a pretty mischievous thing to say. I hope there will be some decent ppl up there who feel bad about fellow humans (like me) being hurt for not accepting unsupported claims, and start a petition or something.
Btw: How could anyone be happy in heaven knowing that others are in agony, just because they tried to be honest. How would that feel after the first trillion years?
quantum mechanics isn't wrong, Einstein and Shrodinger spent years trying to disprove quantum mechanics to no avail. There's something wrong with it, or general relativity seeing as they're mutually incompatible
Iberian cox the quantum world part 1
no, photons do not have mass. Photons are light. nothing travels faster then the speed of light. if photons have mass, it would take all the energy in the universe to get it up to the speed of light. why do particals in the LHC get more heavy and do not increase speed when more energy is put in the particals when they travel at 99.9999% of the speed of light?
It is true photons cause a measureable pressure (look at solarfiols (experimental space-engine)) and action is reaction.
of course it makes sense..The ancients knew it..and albert einstein is the father of it in our time at least=)
Happiness to you
Namaste
The host looks like Keanu Reeves
they don't make sense...yes they do ! they have been tested time and time again... all that's missing is ( how is mass created ) (higgs?) and what is going on with gravity.. 2 great big and difficult questions..but they will be solved soon. it may be enough to unify the forces..otherwise the string theory guys need to get their theory worked out..or we need a machine that can test string theory(??)
Just like we laugh at the previous superstitions and delusions being replaced?
Not of you concentrate and learn them. This is not a Jane and Dick world.