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seen Aug 15 at 13:34

Jul
9
comment Question about an integration by parts in Feynman's Quantum Mechanics
@ChrisWhite: Hah! I didn't see Jim's note until just now. As a tactical matter since books are always in my budget I won't lose anything by getting a feel for Lagrangians, etc. So I will be taking ACuriousMind's advice. But I also suspect some folks can make the necessary inferences with sufficient exposure. And we need contrarians!
Jul
7
awarded  Quorum
Jul
6
awarded  Curious
Jul
5
comment Question about an integration by parts in Feynman's Quantum Mechanics
I believe it's $\delta \dot{x}\frac{\partial L}{\partial \dot{x}}+ \delta x\frac{\partial L}{\partial x}~ ?$
Jul
5
asked Question about an integration by parts in Feynman's Quantum Mechanics
Jun
3
comment A simple osmosis problem
@WYSIWYG: I think that merits a separate question. I wanted to keep this simple because (unless I am missing something) the answer here is correct and not consistent with the one at BioSE. I think if you expand your comment it's fine or perhaps ask a separate question (or I will). I expressly asked this one to avoid the colloid issue that was probably not intentionally in the original problem. Thanks.
Jun
3
awarded  Custodian
Jun
3
reviewed Reject suggested edit on A simple osmosis problem
Jun
1
accepted A simple osmosis problem
Jun
1
comment A simple osmosis problem
@DavePhD: Your answer seemed reasonable to me. Why the deletion?
May
31
revised A simple osmosis problem
added 61 characters in body
May
31
asked A simple osmosis problem
May
5
comment How do we demonstrate that all spectral colors exist in nature?
I think "red shift" covers the Doppler effect but +1 for line broadening. Thanks.
Mar
7
accepted How do we demonstrate that all spectral colors exist in nature?
Mar
7
comment How do we demonstrate that all spectral colors exist in nature?
Thanks for this additional comment. The first sentence sort of says it all.
Mar
6
comment How do we demonstrate that all spectral colors exist in nature?
Well-written, +1. The plot is interesting. But saying, "black bodies emit a spectrum, the sun is a black body, therefore the sun emits a spectrum" only shifts the question to black bodies; and can't a camera miss a discontinuity? I cannot judge your argument about the synchrotron. If you can flesh out your arguments to avoid circularity I'd probably accept this.
Mar
5
comment How do we demonstrate that all spectral colors exist in nature?
Can you explain the phrase "current resolution?" Thanks.
Mar
5
revised How do we demonstrate that all spectral colors exist in nature?
added 150 characters in body
Mar
5
comment How do we demonstrate that all spectral colors exist in nature?
@namehere: no problem, I will try to edit the question a bit thanks.
Mar
5
comment How do we demonstrate that all spectral colors exist in nature?
@namehere: I see it recited that blackbodies emit spectra--and the sun is one. So my question is how can we be sure there is not at least one missing frequency. How would we notice tiny discontinuities? I think dgh might have an answer but I don't know enough about synchrotrons to form a judgment.