2
$\begingroup$

I extract the below text snippet from our text book:

Strong interaction is charge independent.The time interval of such a strong interaction is about $10^{-23} sec$ and it's range is approximately $10^{-15} m$.

I don't understand what is meant by the time interval of a force?

$\endgroup$
  • $\begingroup$ seems to me that $\frac{10^{-15} \text{m}}{10^{-23} \text{s}} = 10^{8} \frac{\text{m}}{\text{s}} \approx c$ means that, like both EM and gravity, the Strong interaction propagates at the same speed $c$. $c$ is not merely the "speed of light" or the "speed of EM" it is more fundamental than that. as seen by a third observer equidistant from points A and B, if a cause at A results in an effect at B, the time interval between cause and effect is the distance between A and B divided by the same $c$. $\endgroup$ – robert bristow-johnson Nov 8 '14 at 16:04
1
$\begingroup$

The time $10^{-23}$ seconds is about the time needed for light to cross a distance of $10^{-15}$ metres, so you could interpret it as a timescale in this sense. However I'm not sure that the time interval of such a strong interaction is a terribly useful concept.

The nearest I can think of to a useful definition of time interval of such a strong interaction would be to look at the energy width of resonance peaks in measurements made at a collider, then relate this to the lifetime of the particle using the uncertainty principle.

$\endgroup$
0
$\begingroup$

This time is a time of a nuclear reaction. There are nuclear reactions with their characteristic times - how fast nucleons are rearranged during reactions, something like that.

$\endgroup$
  • $\begingroup$ would you give me a more detailed answer? $\endgroup$ – RogUE Nov 8 '14 at 15:02
  • 1
    $\begingroup$ @RogUE: Yes, I could give some details, but I do not want to. Please read more about nuclear reactions. $\endgroup$ – Vladimir Kalitvianski Nov 8 '14 at 15:29

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.