46,855 reputation
229100
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location Greece
age 74
visits member for 3 years, 6 months
seen 20 mins ago

Retired experimental particle physicist.

The picture is a fayum . It looks like aunts and cousins of mine :).


Jul
8
answered Why do we deal only with large scale magnetic fields in astrophysics, and not electric fields?
Jul
8
answered Why are laws of physics always of product forms?
Jul
7
comment Idea is to make an equipment like torch, which should emit darkness.. Is it possible?
the closest I have seen is this antilaser experiment wired.com/2011/02/real-live-antilaser
Jul
7
revised Anti-laser: How sure we are that energy is transported?
rethought part of answer
Jul
7
comment Demonstration that vibrating basic particles constitute non-vibrating individuals
Maybe you are using a translating program? Your question does not make sence. Are you talking about the wave particle duality?
Jul
6
answered Why do we remember the past but not the future?
Jul
6
answered Why ONLY Maxwell's equations are the basic equations of electromagnetism?
Jul
6
answered Is there a limit to acceleration?
Jul
5
comment How does AC current flow in an open circuit?
from your link the transformer that supplies the house is grounded . So you are talking of the incoming to the transformer single line touching ground: a huge short.
Jul
5
comment What predictions can a quantum gravity theory make?
to continue on @Christoph ' comment, it is a general point that the homogeneity of the cosmic microwave background radiation can be explained using quantum gravity postulating an early inflation period, as is the case in the current Big Bang model, an extension of your 3. i.e. there already exist unexplainable data except through QG. The extra data of BICEP2 are a confirmation in a sense.
Jul
4
awarded  Nice Answer
Jul
4
comment Electromagnetic Field VS Photons
How mathematically classical electromagnetic fields emerge from a large number of photons is explained in this blog entry, motls.blogspot.com/2011/11/…
Jul
4
comment How does AC current flow in an open circuit?
If you are asking whether we could dispense with the return neutral that closes the circuit with the generator and just use a live wire at the generator with a ground , and the ground as the return at home, it would be very inefficient and expensive as the path back to the generator will involve unknown effective resistances and capacitence and the circuit will be unreliable. in my opinion.
Jul
4
comment How does AC current flow in an open circuit?
A current has to flow. We start at a generator end create an alternating field on two wires, which if joined with some resistance in between will close a circuti and alternating current will flow from the generator creation ends to the resistor and back, closing the circuit. Grounding one of the lines means is a safety feature, it does not change the circuit, it keeps a 0 potential with one of the wires and 220 on the other. Grounding in at home is also a safety feature, except there is little danger from the neutral and a lot from the live if it ends on the outside of an appliance.
Jul
4
answered How does AC current flow in an open circuit?
Jul
4
comment Can we solve California's drought crisis by pointing parabolic mirrors at the ocean?
Mirrors could be on the shore. not good for tourism of course but good for maintenance
Jul
4
comment Can we solve California's drought crisis by pointing parabolic mirrors at the ocean?
On large projects like this one needs calculations and data : how much humidity with what wind conditions etc to aim at reproducing rain cloud conditions. Maybe a modificatin of "salter ships" would be a better solution rsta.royalsocietypublishing.org/content/366/1882/3989.long .
Jul
4
comment Can we solve California's drought crisis by pointing parabolic mirrors at the ocean?
note you could use parabolic mirrors from the shore so you would be cooling the shoreline while evaporating the ocean
Jul
4
awarded  Nice Answer
Jul
3
awarded  Nice Answer