How can something have no "rest mass", but have momentum? Seems like a contradiction?quote:
Originally posted by Michael SR:
photons have no "rest mass," but they do have momentum. it's part of the wave-particle duality.
but essentially, e-m waves (light) have no mass, no.
-michael
Bob, Get out your bottle of Excederin and cogitate on this for awhile. It's been about 35 years since I went through those equations, so would can't say I have a good feel for them anymore.quote:
Originally posted by Bob Woods:
How can something have no "rest mass", but have momentum? Seems like a contradiction?
Welcome to the Quantum world!
The Compton effect is that if you are driving your white *ss through Compton after dark and come stop moving, you will cease to exist.quote:
Originally posted by FowVay:
The Compton effect is based on the total absorption of photon energy and is one mathematical formula used.
Recall that momentum p = mv, or mass x velocity. For a photon, the mass being spoken of here in "inertial" mass, not rest mass. Inertial mass is that equivalent mass of an object due to its inertia.quote:
How can something have no "rest mass", but have momentum? Seems like a contradiction?
I thought they fixed broken computer hard drives...quote:
Originally posted by XS650:
Don't Quantum mechanics fix old Volkswagens?
I thought he called it "spooky at a distance" with respect to the wave particle duality.quote:
Originally posted by outrun:
Duality?
Welcome to the amazing world of quantum physics and then wonderful wave-particle theory.
I may act like both...but only one behavior at a time
Professor Einstein's word on quantum physics, "spooky"
quote:
Originally posted by XS650:
The Compton effect is that if you are driving your white *ss through Compton after dark and come stop moving, you will cease to exist.quote:
Originally posted by FowVay:
The Compton effect is based on the total absorption of photon energy and is one mathematical formula used.
MoleKule, as I understand: electric charge is just a presence or absence of extra electrons. What is mass? Is it a presence of some additional matter? If yes, then some latest research into anti-matter (or dark matter) might be onto something. On the other hand if the answer is still yes, we have much more questions than answers. What actually defines this matter and its properties? Electric charge can be transferred, is it also the case with mass-matter-energy case? Black holes, in theory, have no real (as we define it usually) matter whatsoever, yet they have mass and electric charge. What happens at this point? Does matter gets transferred into its original state? Does it become a pure mass without any real physical properties? Or it does have some very specific properties without original representation? This topic is very interesting, yet confusing for the lack of knowledge. If you or someone else can shine some light onto it I would be very grateful.quote:
Originally posted by MolaKule:
Here is an analogy that might help:
Two electrostatic particles of different signs of charge have a force of attraction between each other because they create a field around themselves (the electric field E). This field is the "intelligence" that tells one particle that another particle is somewhere in space.
Likewise, a mass is the charcteristic of an object such that it sets up a gravitational field which provides a force to attract another mass.
A force in both cases is defined as an interaction that causes one body to accelerate toward another. And acceleration of course, is the rate of change in velocity of an object.