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Dec
4
comment What would happen if you put your hand in front of the 7 TeV beam at LHC?
the reflex time of 0.1-0.2 seconds is much larger than the time it takes for the beam to do one turn (which is about $90 \mu s$), once protons interact with the hand, most of them will not make another turn (the beam blows up in the transverse direction), i.e. the reaction time is slow enough to absorb one beam entirely. $1.2 \cdot 10^{11}$ is more the number of protons per bunch, of which there are up to 2808 per beam (see here which would give $3.4 \cdot 10^{14}$ protons per beam.
Dec
4
comment What would happen if you put your hand in front of the 7 TeV beam at LHC?
The design number of bunches is 2808 per beam (see here and $1.15\cdot 10^{11}$ protons per bunch ($3.2 \cdot 10^{14}$ protons per beam), you'll get 362 MJ per beam (at 7 TeV beam energy)
Nov
29
awarded  Yearling
Nov
28
comment What role did the Higgs boson play in the Big Bang?
see the Wikipedia article on the Inflaton, which is a general term for a scalar field which drives inflation. The Higgs field is a scalar field and could be the Inflaton (i.e. drive inflation).
Nov
18
revised How does a magnetic monopole break time reversal symmetry?
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Nov
18
revised How does a magnetic monopole break time reversal symmetry?
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Nov
18
answered How does a magnetic monopole break time reversal symmetry?
Nov
7
comment Unitarity of PMNS matrix
if any row or column squared sums to something less than one (experimentally), this is an indication that we're missing something, e.g. a fourth row/column corresponding to an additional species of neutrinos.
Nov
6
comment Software for calculating Feynman Diagrams
MadGraph does only tree level (no loops but many outgoing particles), MadGraph5_aMC@NLO can do one loop
Nov
5
comment Kitchen floor dries faster with lights on?
although traditional incandescent light bulbs and fluorescent tube lights have an efficiency far below 50% (according to en.wikipedia.org/wiki/Fluorescent_lamp#Luminous_efficacy), so more energy is converted to heat than to light for these.
Nov
1
comment Kitchen floor dries faster with lights on?
yes, good point, and the water in turn would heat the region of air immediately above the water
Nov
1
revised Kitchen floor dries faster with lights on?
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Nov
1
revised Kitchen floor dries faster with lights on?
added 1208 characters in body
Nov
1
answered Kitchen floor dries faster with lights on?
Oct
10
comment How detectors in particle colliders can differentiate neutrons from antineutrons?
because anti-quarks in the anti-neutrons annihilate with the quarks in the protons and neutrons in the carbon nuclei while at such low energies, a neutron essentially behaves like an (unbreakable) ball
Oct
9
answered What are the main algorithms the LHC particle detectors use to reconstruct decay pathways?
Oct
9
answered How detectors in particle colliders can differentiate neutrons from antineutrons?
Oct
4
answered Use of fission products for electricity generation
Sep
29
comment How can I measure the speed of a figure skater's spin?
the stroboscope (or camera flash which has such a function) probably only works well if she can spin for a enough time while you adjust the stroboscope's frequency...
Sep
29
comment why are two higgs doublets required in SUSY?
see also physics.stackexchange.com/questions/116598/…