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Jun
13
comment Uncertainty principle - momentum so precise that uncertainty of position is outside light-cone?
how can we talk about particles for which we are not certain they are somewhere in the universe ?
May
9
revised Are nodes and orbitals in atoms simply probability distribution clouds or are they of any physical relevance?
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May
9
awarded  Yearling
May
8
answered DC current in ideal conductor and skin effect?
May
8
answered Resistor and LED - together and separated
May
8
answered Are nodes and orbitals in atoms simply probability distribution clouds or are they of any physical relevance?
May
5
comment Distance and time measurement in the famous Superluminal Neutrinos Experiment
see mi.infn.it/~psala/Icarus/nugsweb/cngs_und.jpg on your question 1 ('Ginevra' is where CERN is). The maximum depth of the path is 10km underground... Digging a tunnel of 700km length may technically be possible but is too expensive (not to mention the time it would take to complete...)
Mar
1
revised Why are radio waves in the 1.43 - 2.5 Mhz range invisible?
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Mar
1
revised Why are radio waves in the 1.43 - 2.5 Mhz range invisible?
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Mar
1
answered Why are radio waves in the 1.43 - 2.5 Mhz range invisible?
Feb
27
comment What will happen if we will be able to produce a quark-gluon plasma and the we cool it down?
yes, the quark gluon plasma also contains antiquarks. Even an ordinary proton contains anti quarks in what is called the 'sea'. These are created when a gluon splits into a quark/anti-quark pair and normally 'recombine' quickly but they can interact with the quarks/gluons/antiquarks of another proton in a collision. So even if no quark gluon plasma is created in a particular proton-proton (or Lead ion-Lead ion) collision, antiparticles (such as antiprotons) can be produced.
Feb
27
comment What will happen if we will be able to produce a quark-gluon plasma and the we cool it down?
yes, the purpose of colliders is to have energies (or better: energy densities) similar to those shortly after the big bang (in the lab) to study the relevant physical processes which led to the formation of the universe we know today.
Feb
27
comment What will happen if we will be able to produce a quark-gluon plasma and the we cool it down?
yes, exactly. Protons and neutrons are baryons (but in principle other baryons could be formed as well but these are typically short lived as are the mesons).
Feb
27
revised What will happen if we will be able to produce a quark-gluon plasma and the we cool it down?
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Feb
27
answered What will happen if we will be able to produce a quark-gluon plasma and the we cool it down?
Feb
27
comment Is there any way to annihilate matter without the use of anti-matter?
The experimental lower limit on this decay mode of the proton (see pdg8.lbl.gov/rpp2013v2/pdgLive/… ) is $8.2 \cdot 10^{33}$ years (the corresponding publication is here: inspirehep.net/record/814697 ) . This is $5.9\cdot 10^{23}$ larger than the estimated age of the universe (13.8 billion years).
Feb
19
comment Why does the Sun turn red near sunset?
yes, redshift from Doppler effects are negligible (40'000 km / day is about $1.5 \cdot 10^{-6}$ of the speed of light). If the redshift were responsible for the sunlight turning red in the evening one would expect it to be affected equally by blue shift in the morning...
Feb
19
comment Why does the Sun turn red near sunset?
I've seen many red sunrises. Are you sure you start watching the sun in the morning at the same altitude (height above the horizon) as you experience it red in the evening ? Is the region west of you more dusty than the area east of you (e.g. land on the west, sea on the east) ? Is air pollution in your area stronger in the evening than in the morning ?
Feb
18
revised Why does the Sun turn red near sunset?
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Feb
18
answered Why does the Sun turn red near sunset?