[b]1.
An elementary particle of mass M completely absorbs a photon, after which its mass is 1.01M. (a) What was the energy of the incoming photon? (b) Why is that energy greater than 0.01Mc2?
Homework Equations
p (photon) = E/c
p (particle) = γmv
p(i) = p(f)
Ek = γmc^2 -mc^2...
I've been thinking about dark matter, WIMPs and neutrinos, and why these particles would not interact with matter through the strong force. All massive particles interact gravitationally, all charged particles interact electromagnetically, (I don't fully understand the weak force, so I won't...
Homework Statement
Find the average value of the function f(x,y,z)=xyz on the unit sphere in the first octant
Homework Equations
I know that I need the surface integral of xyz over the sphere and then need to divide by the surface area of the region, but I'm having a hard time setting...
After reading your post again I could simplify my answer to this: There is a need to unify GR with QM because neither theory can explain everything in physics. QM breaks down as the particles increase, and GR breaks down when talking about the sub atomic. Physicists aren't happy having two...
I had a similar question that I posted a few days ago. Quantum mechanics is good at explaining the sub-atomic, and general relativity is good at explaining the cosmic. Quantum field theory is theorizing gravitons as the mediators of the gravitational force. You suggest that gravity is just the...
I would have to agree that often Hawking's popular media oversimplifies things, but I am only a junior in high schools without any formal education on the topic so they are helpful introductions. I'm sorry but so far all of you have said how virtual particles aren't part of Hawking's...
so the universe can expand without moving any matter faster than the speed of light relative to any other body? I still can't understand how if there has been only 14 billion years to travel, how anything could be farther than 14 billion light years away without breaking the laws of special...
Actually, let me correct myself. I referenced my handy copy of A Brief History of Time and read the section on virtual particles. Hawking writes
"A real particle close to a massive body has less energy than if it were far away, because it would take energy to lift it far away against the...
What someone recently told me on this forum is that all virtual particles, either normal matter or antimatter, can be thought of as having negative energy. It is not until one particle is freed from the pair that it become "real" and then has positive energy. Thus, it isn't always the antimatter...
How can the universe, either visible or entire, be any larger than 14 billion light years in diameter if it is only 14 billion years old? Since nothing can travel faster than the speed of light, wouldn't that create a boundary around 14 billion light years? and that's in the universe is...
Astronomers say that there is neither an edge or center to the universe, yet we live in a finite universe. I understand how our universe can be finite yet have no edges due to the curvature of the universe, but I can't understand how it doesn't have a center. Space must be being curved around...
So string theory is postulating that gravitons are closed loops that can move between branes correct? Would this possibly explain why they would cause curvature in the 4 dimensions that we can observe? If the particles travel between extra dimensions it seems to me that the effects in our 4...
Ok so no matter what particle falls into the event horizon, since it is a virtual particle, has negative energy? and the one that escapes becomes a real particle with positive energy? That makes more sense thank you