40,811 reputation
356130
bio website inspirehep.net/…
location Duchy of Grand Fenwick
age 44
visits member for 4 years, 7 months
seen 16 mins ago

Experimental nuclear and particle physicist. These days I'm teaching, but I've spent a lot of time on nucleon structure in fixed target electron scattering and neutrino oscillations using reactors and beam sources.

Been reading Zemansky & Dittman's book on thermodynamics recently. Quote: ``The concept of temperature is rich in interpretations and levels of abstraction.'' Nice.


Jul
8
reviewed Approve Fermi-Energy Level for Extrinsic Semiconductor
Jul
8
reviewed Approve Barbells and gravity
Jul
8
comment Barbells and gravity
Tim, you seem to have lost contact with the posting account. You can have accounts merged, but if you continue to use cookie-based (unregistered) access this will probably happen again and again. Perhaps you should consider registering if you intend to use the site regularly.
Jul
8
comment Where does additional heat energy come from in isothermal step of Carnot cycle
To achieve this one needs the reservoir to be arbitrarily large in size and the process to proceed arbitrarily slowly (often termed "quasi-static").
Jul
8
comment Explaining lightyear to non technical people
"some galaxies are 15 lightyears in diameter" Er...15,000 light years is still quite a small galaxy, and 150,000 light years is only a bit larger than our Milky Way. google.com/search?q=size+of+the+milkyway
Jul
8
reviewed Approve Costant volume gas thermometer
Jul
8
comment Kinetic energy of a rotating rod
Now you are getting there. So you integrate over the whole volume, using fro each element the local speed which you can get from the rotational speed by considering the length of the path it takes in one revolution.
Jul
8
revised Eigenstate of position+momentum?
added 11 characters in body
Jul
8
revised Eigenstate of position+momentum?
improved latex and better explanation in the text; add some stuff about commutators
Jul
8
revised Eigenstate of position+momentum?
improved latex and better explanation in the text
Jul
8
answered Eigenstate of position+momentum?
Jul
8
comment Kinetic energy of a rotating rod
"For v I used 33.33, since I figured if it's moving that fast perminute, then that's its speed." This is why you should always write down the units. Revolutions per minute is not a velocity and if you put it into $\frac{1}{2}mv^2$ as the velocity the result does not have units of energy.
Jul
7
comment Eigenstate of position+momentum?
Have your studies progressed to the point of talking about "commutators" yet? This is very easy to answer with them, a bit more involved without.
Jul
7
revised Eigenstate of position+momentum?
latexify; strip thanks
Jul
7
comment Is the Mendeleev table explained in quantum mechanics?
Major edits rolled back. This is not a discussion forum, nor it is a platform for your epistemological arguments. We do science here, not pure math. Formal proofs take a back seat to correct predictions and agreement with reality. I understand that you wanted this to be on a math site, but it is on a physics site.
Jul
7
revised Is the Mendeleev table explained in quantum mechanics?
rolled back to a previous revision
Jul
7
comment Is space “real”, or is it some sort of accepted postulate?
Peter, I'm not sure what you are looking for, "space" and "time" are the labels that we associate with the observed facts that events can be separated from one another in various ways. That fact is fundamental. I know that sounds obvious, superficial and even tautological but it a very basic thing (so basic that you take it for granted).
Jul
7
comment History of the elementary particles
@TMS Yes, looking at the blind alleys can be instructive, but as asked the question calls for book length answers.
Jul
7
comment Do photoelectrons move fast enough to use special relativity? (+ homework)
I'd like to emphasize John's last comment there: there is not magic speed where you flip from Newtonian to Einsteinian mechanics. Relativity is always correct, but you might be able to use Newton if you can tolerate the errors. So the twin questions are "What size errors do I care about?" and "What size errors do I think I make if I use Newton in this case?".
Jul
7
comment Is it necessary to consume energy to perform computation?
The Feynman Lectures on Computation is a slim little volume that includes a presentation of the state of this art a few of decades ago. Very accessible to most physicists.