Reputation
79,509
Next tag badge:
99/100 score
38/20 answers
Badges
3 60 209
Impact
~3.0m people reached

1d
comment How many photons are there in free space on average
that should be 14billion - 380000light years because it is then when the photons decoupled
1d
answered Cause for spikes in trinity bomb test
1d
comment How many photons are there in free space on average
Have a look at zuserver2.star.ucl.ac.uk/~idh/PHAS1102/problems/PHAS1102_a4.pdf to get an order of magnitude . The answer to the last is no, since the energy is very small and uniform,. en.wikipedia.org/wiki/Cosmic_microwave_background
1d
comment I open the fridge - do I let the heat in or the cold out?
@mmesser314 I think the comment by OwenBoyle is for you
2d
comment How does a Collider work?
You are asking for a set of courses in experimental and particle physics. better start from the wiki en.wikipedia.org/wiki/Collider . What happens when particles collide is the graduate course for a degree in high energy physics
2d
revised Cherenkov radiation can it happen in a jar using tap water with 8 thorium laced lantern mantles as a radiation source
clarification
2d
answered Cherenkov radiation can it happen in a jar using tap water with 8 thorium laced lantern mantles as a radiation source
2d
comment What does electric field of unpolarized light look like when measured?
@Numrok he is talking of "the analogous function for photons" does not exist, and that is wrong. It does and is unobservable and in that sense the link I gave describes the analogous build up to a density matrix. And I think the linked answer is correct .
2d
answered Reduction of Earth's rotation due to increase in humidity
2d
comment What does electric field of unpolarized light look like when measured?
continued see this blog on photons building up classical em wave motls.blogspot.com/2011/11/…
2d
comment What physics does the Super Proton Proton Collider intend to explore in the $\lesssim 100\:\mathrm{TeV}$ range?
@Siva it seems I am wrong about the ILC being a CERN project, see the comment bt Paganini
2d
comment What physics does the Super Proton Proton Collider intend to explore in the $\lesssim 100\:\mathrm{TeV}$ range?
@Paganini Thanks, I am out of date on ILC; though this FCC still seems to me an impossible goal thinking of the land. Already the LEPtunnel was very deep into the mountain.
2d
comment What does electric field of unpolarized light look like when measured?
The photon has a complex wave function, not measurable, it is the solution of the potential form of maxwell's equation turned into an operator on psi equation. Light is built up by a confluence of innumerable photons
Feb
3
answered Can the law of entropy decide our fate?
Feb
3
comment What physics does the Super Proton Proton Collider intend to explore in the $\lesssim 100\:\mathrm{TeV}$ range?
@Siva To run 50 TeV colliding protons it will need the much larger radius , and it will be OK for electrons. It is a competition , the ILC is the next project of CERN . Unless new methods of acceleration are developed it is not probable that new circular accelerators will be built at CERN as what with the mountains and the lake the space is not enough. If China foots a lot of the bill for the tunnel the project gives a future to accelerator physics. My opinion has been for a long time that new methods of acceleration have to be developed, and maybe with nanotechnology it will happen.
Feb
3
revised What physics does the Super Proton Proton Collider intend to explore in the $\lesssim 100\:\mathrm{TeV}$ range?
added 121 characters in body
Feb
3
answered What physics does the Super Proton Proton Collider intend to explore in the $\lesssim 100\:\mathrm{TeV}$ range?
Feb
3
revised A Neutron Star and an Atom are Similar
drastic clarification also after comments and negative votes
Feb
2
comment What physics does the Super Proton Proton Collider intend to explore in the $\lesssim 100\:\mathrm{TeV}$ range?
@CuriousOne nothing is fixed. It will be in competition? who knows
Feb
2
comment What physics does the Super Proton Proton Collider intend to explore in the $\lesssim 100\:\mathrm{TeV}$ range?
@CuriousOne if you read up he is trying to build up an international collaboration a la CERN experiments