In the Kortewege de Vries equation what is the physical origin of the
linear and non-linear terms? I'm thinking of the explanation of a water wave here.What properties of the water molecules cause the profile and stability of the wave?
Is it possible that electron transitions from a high energy state to a low energy state are caused by the electrons interacting with some other partilces in the space around atoms.Let's look at the case of a hydrogen atom:
According to Niels Bohr, for an electron, r = n^2 h^2 / (8 pi x epsilonx...
Is it the case that, for mass being caused by a particle being repelled by a field (the bigger the force of repulsion, the greater the mass),
that the field has to give the relation, for one unit of mass:
force is inversely proportional to
[(distance between particle which has mass and...
Quarks can't exist in isolation and the electric charge on quarks can't exist in isolation from the electric charges of other quarks either.The electric charge of leptons like the electron can exist in isolation.Isn't electromagnetism showing a kind of asymmetry here: symmetry could be restored...
If the universe oscillates between a Big Bang and a Big crunch,
can two small volumes of dark energy, at opposite ends of it, be considered to be undergoing simple harmonic oscillation?
The potential energy of an oscillator could be given by G m1 m2 /r where
m1 is the mass of a volume of...
An orbiting electron that is further from a proton has a higher energy .
And is attracted to the proton by a weaker electric force.
If space is filled with fast-moving particles they could push the electron closer to the proton and back to the groundstate so a photon would be emitted.For a...
Under what circumstances could the colour force ( or the strong residual force) become repulsive between quarks? I've heard that changing the spin of a force carrier can in principle make a force repulsive when it was previously attractive.If gluons exchanged between quarks became fermions with...
If neutrons stay intact and get closer together than 10^-15 metres in a neutron star, would the exchange of mesons between neutrons stop and be replaced by the exchange of gluons, and would the gluons cause an attractive or repulsive force between neutrons? A repulsive force could
Would a massless spin 2 boson travelling at light speed collide with a fermion to yield particle-antiparticle pairs (if the spin 2 was a graviton the particles would have to have a very small mass so far undetected by science)?
Could this spin 2 boson be electromagnetic in nature?
The problem David Bohm's pilot wave theory has is that standard QM has been so successful and verified by experiment so many times that few physicists
will not feel motivated to challenge it, and also
Bohm's theory does not make predictions that are at odds with
QM and therefore would allow a...
How long do particles take to change their mometum when they "bounce"
off a surface and when they are absorbed by a surface?
Do photons have a noticeably different "bounce" and absorption time to particles with rest mass?
Can a neutron have a rest mass and be at rest in reality rather than...
Is it alright to say that force = rate of change of relativistic momentum
F = [ m0 v2 / (1 - v2^2/c^2)^1/2 - m0 v1/(1 - v1^2/c^2)^1/2 )] / (t2 - t1)
and can this relation be used to get sensible results for particles?
This is a link that shows a visual depiction of decoherence:
and this is a link with the technical details of decoherence:
Is the second link saying that measuring...
Experiment shows that many physical quantities are conserved
and that the associated conservation laws can be linked to symmetries.
However it seems strange that general relativity is a theory built from
principles of symmetry and yet energy might not be conserved in general relativity.Surely...
This weblink is about C60 buckyballs passing through a diffraction grating and showing wave-like behaviour.Since the buckyballs are moving quite slowly -
about 210 m/s would it be possible to fire a neutron beam through the...
When a star of a few solar masses collapses and starts to form a black hole,
if the particles of which the star was made get closer and closer together
as the density increases, will there come a point at which no force mediating
particles have a short enough wavelength to get between the...
When the flow of deep cold water in the atlantic speeds up what causes
the amount of water vapour in the tropics to increase too.Could
magma in the Earth be heating the sea water or hydrothermal vents - presumably sea currents would have to move to a hot spot or somehow
encourage vents to...
What evidence is there that the schwarzschild metric is valid inside a black hole (as opposed to outside the Sun where evidence comes in the form of mercury's perihelion)?
Also, if a black hole is made from photons, would it be massless and move at
the speed of light?
If we imagine a fluid travelling through a pipe as being a warm
current of sea-water moving over a cold denser layer of sea-water,
with the air immediately above the warm current forming one wall of
the pipe, would the pressure
of the warm current decrease as the current travels faster,and...
A rectangular piece of paper spins rapidly about its longitudinal axis as it falls
through the air.It takes longer to reach the ground than other shapes of paper.Why is this given that it spends a lot of time edge on to the flow of air and so encounters less resistance from the air than a...