7,940 reputation
1335
bio website sjbyrnes.com
location Massachusetts
age
visits member for 3 years, 11 months
seen 35 mins ago

May
6
revised Is it feasible to transfer energy from power stations to communities via photons instead of electrons?
edited body
May
6
answered Is it feasible to transfer energy from power stations to communities via photons instead of electrons?
May
4
comment Do We Need Maxwell's Equations Since They Fail to Account for An Experimental Fact at Least in One Occasion?
Thanks, I corrected the text.
May
4
revised Do We Need Maxwell's Equations Since They Fail to Account for An Experimental Fact at Least in One Occasion?
respond to comment - perihelion precession & fix typo
Apr
13
reviewed Approve Theoretically, is it necessary that if light passes through a glass slab, its intensity should decrease?
Apr
13
comment By what maximum amount can we concentrate sunlight?
The real limit is that you see the sun in every direction, not just the upper hemisphere of directions. Mirrors do exist! The upper hemisphere alone should only give you 25000x, iirc. You must have made an error but I'm not sure what.
Apr
10
answered Calculating the beating length of the directional coupler
Apr
10
answered image transmission through waveguides
Apr
7
revised Blackbody radiation and emissive power
added 330 characters in body
Apr
6
comment How to calculate liquid pressure regardless of the gravity?
Two questions: (1) Do you know n (number of air molecules)? (2) Is the balloon made of a stretchy elastic material like rubber? (If so, the rubber provides almost all the pressure and the water outside can be ignored!)
Apr
6
answered Blackbody radiation and emissive power
Mar
31
answered Unit consistency
Mar
24
awarded  Nice Answer
Mar
23
comment Can a nuclear bomb be used as the power source for a laser beam
See en.wikipedia.org/wiki/Nuclear_pumped_laser but I don't know any details
Mar
18
revised Classical Hall effect when current has neutral charge
add link title and author
Mar
18
answered Classical Hall effect when current has neutral charge
Mar
10
answered Sign convention in optics
Feb
16
comment What is thermodynamic equilibrium?
@EnochArden - The laws of thermodynamics are not axioms handed down by God. They are consequences of statistical mechanics, just as all macroscopic laws of physics can be derived from microscopic starting points. See any statistical mechanics textbook for detailed derivations.
Feb
16
comment What is thermodynamic equilibrium?
@EnochArden - The velocity distribution of a gas is macroscopically measurable - look at doppler shifts of spectral lines for example - as is whether light satisfies a blackbody distribution etc. I take the Boltzmann distribution as a starting point: P~exp(-E/kT). There's a letter "T" in that formula, it's a parameter, and everybody refers to this parameter as "temperature". That's all I mean by "temperature", there's nothing circular there.
Feb
16
answered What is thermodynamic equilibrium?