|WikiProject Physics||(Rated Start-class, Mid-importance)|
Other than B it almost seems like the author went out of his way to use non-standard symbols. In the literature most use tau for torque, rather than capital gamma, and L (sometimes I) for angular momentum, rather than J. It may seem trivial but it confuses and requires the reader to carefully translate in their head each symbol.
- Just wanted to note that this was answered at the FID talk page. --Qrystal (talk) 22:33, 23 November 2007 (UTC)
Total Angular Momentum?
Was just trying to determine whether this page is referring to the total angular momentum, or just the spin angular momentum. It isn't clear from the context of the page, unless of course, the meaning of J is what makes it clear. If so, wouldn't it be better to be explicit about what J represents, by clearly stating that it means the total L + S? --Qrystal (talk) 22:47, 23 November 2007 (UTC) In practice, this is a very complicated question. Depending on the frequencies used, this can be the frequency of a single object, or a composite object. I think the formula applies generally to any object for which you know the gyromagnetic ratio... although I can't promise. —Preceding unsigned comment added by 184.108.40.206 (talk) 02:22, 2 October 2008 (UTC)
what is the energy formula? clearly energy should be released. Since the precession will cause the electromagnetic wave, i.e. the release of photon. it must be in a higher energy state, then precesses and release energy by release a photon to lower energy state. What are two energy levels? and they difference? Jackzhp (talk) 23:05, 17 September 2013 (UTC)
The direction of the precession is shown in this video: http://www.youtube.com/watch?v=MOrk9ZQy1Dw. It would appear that the schematic at the top right of this Wikipedia article shows the precession to be in the wrong direction! Or am I missing something? 220.127.116.11 (talk) 02:52, 20 November 2013 (UTC)
- I suspect you are right. From HERE, "ω = -dφ/dt (the rotation is left-handed in the direction of B)" The answer may be that the precession of magnetic moment is this way, whereas for a negatively charged particle the spin and magnetic moment are in opposite directions. The small arrow in the figure seems to be the spin angular momentum vector, and the particle is negatively charged. Not sure I am happy with the figure this way. Bdushaw (talk) 11:20, 27 January 2015 (UTC)
- See, for example, this figure from gyromagnetic ratio. For a negatively charged particle gamma is negative. The figure seems to show the spin vectors in both cases, rather than the magnetic moment. Still not happy with that. Bdushaw (talk) 11:35, 27 January 2015 (UTC)