SR Kinetic Energy Mass Increase for Uncharged Particles?

In summary: However, this is not what we observe.Quoted: If neutrinos have mass, they would not pass the speed of light.
  • #1
LarryS
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The mass of a particle will increase as its velocity increases according to special relativity. This has been confirmed in countless experiments in which particle accelerators accelerate charged particles.

What type of experiments have confirmed this for uncharged particles?

Thanks in advance.
 
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  • #4
If energy and momentum did not vary with speed in the same way with uncharged particles as with charged ones, the folks at CERN would be in big trouble in the analysis of their experiments.
 
  • #5
jtbell said:
If energy and momentum did not vary with speed in the same way with uncharged particles as with charged ones, the folks at CERN would be in big trouble in the analysis of their experiments.

Makes sense. Thanks.
 
  • #6
jtbell said:
If energy and momentum did not vary with speed in the same way with uncharged particles as with charged ones, the folks at CERN would be in big trouble in the analysis of their experiments.

For example, nTOF at CERN. Relativistic uncharged particle experiments, as requested by the OP: http://home.cern/about/experiments/ntof
 
  • #7
  • #8
A neutral object can be formed as a composite of charged objects, so it's hard to see how neutral and charged objects could obey different rules. For example, a neutron is actually a bound system made of three quarks, which are all charged. If you do an experiment with neutrons, and say, "hey, I've tested the kinematics of neutral particles," I could say, "no, you did an experiment with quarks, which are charged."
 
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  • #9
referframe said:
Quoted: No it won't, read this:
https://www.physicsforums.com/insights/what-is-relativistic-mass-and-why-it-is-not-used-much/This paper seemed to be more about "relativistic mass" becoming any obsolete term. I did not see anything suggesting that the mass of an uncharged particle would not approach infinity as its velocity approached the speed of light.
I wrote it, it is exactly what it says. With relativistic mass becoming obsolete, there is only one mass which physicists really talk about (hence we never need to use the "rest" or "invariant" to prefix this mass). This mass does not change with velocity and is a relativistic invariant. The concept of relativistic mass fell out of fashion not only because it does not really have the properties you would expect from a mass, but also because there already is a quantity describing the same thing - the particle energy.
 
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  • #10
The perhaps best test of the energy of a neutral massive particle growing unbounded as it approaches the speed of light would be neutrino time of flight experiments. We here have a neutral particle with a miniscule mass and no matter how much energy you put in, it does not pass the speed of light.
 
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  • #11
If neutral and charged particles obeyed different kinematics, one could use the difference to determine absolute velocity.
 

1. How does special relativity explain the increase in mass of uncharged particles as they gain kinetic energy?

According to special relativity, the mass of a particle is not a constant value, but rather depends on its velocity. As a particle gains kinetic energy and approaches the speed of light, its mass increases due to the effects of time dilation and length contraction.

2. Is there a limit to how much mass an uncharged particle can gain through kinetic energy?

Yes, according to special relativity, the mass of a particle can theoretically increase infinitely as it approaches the speed of light. However, due to the immense amount of energy required to accelerate a particle to such speeds, this is not practically achievable.

3. How does the increase in mass affect the behavior of uncharged particles?

The increase in mass of uncharged particles at high speeds has a significant impact on their behavior. It makes them harder to accelerate, and they require more energy to maintain their velocity. Additionally, their momentum also increases, making them more difficult to change their direction of motion.

4. Can the increase in mass of uncharged particles be observed in a laboratory setting?

Yes, the increase in mass of uncharged particles can be observed in laboratory experiments such as particle accelerators. By accelerating particles to high speeds and measuring their mass at different velocities, scientists have been able to confirm the predictions of special relativity.

5. Does the increase in mass of uncharged particles have any practical applications?

Yes, the increase in mass of uncharged particles is a crucial factor in the design and operation of particle accelerators and nuclear reactors. It also has implications for space travel, as it affects the amount of fuel and energy needed to accelerate a spacecraft to high speeds.

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