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seen Mar 26 at 14:43

Feb
18
comment Collision of two photons
see also physics.stackexchange.com/questions/1361/… . They used terawatt pulses of laser light to experimentally demonstrate light by light scattering.
Feb
16
comment Radiation exposure to a child who was briefly in the presence of an adult who had received a 18FDG PET scan
also less than the dose absorbed during a transatlantic flight ($7\cdot10^{-5} $ Sievert) according to this source
Feb
14
answered Trilinear gauge couplings: Spin
Feb
14
comment At what depth in the water atmospheric pressure is 100 times greater than on the ground?
the keyword is hydrostatic pressure
Feb
14
comment At what depth in the water atmospheric pressure is 100 times greater than on the ground?
to be picky, at the surface, you already have one atmosphere of pressure, so one should add/subtract that (and you'll get about 9.81m less depth)...
Feb
13
revised Muon production in particle accelerator
added 69 characters in body
Feb
13
answered Muon production in particle accelerator
Feb
11
answered Why do astronomers never put a scale on their photographs?
Feb
11
answered What would happen if Large Hadron Collider would collide electrons?
Feb
9
comment Impulse from absorbing a photon? Is there an increase in rest mass?
from Wikipedia: It is not good to introduce the concept of the mass M = m/\sqrt{1 - v^2/c^2} of a moving body for which no clear definition can be given. It is better to introduce no other mass concept than the ’rest mass’ m. Instead of introducing M it is better to mention the expression for the momentum and energy of a body in motion.
Feb
7
comment Dimension of Dirac $\gamma$ matrices
yes, it's definitively possible to have matrices larger than 4x4 satisfying the above relations, see this Wikipedia article and this link
Jan
25
revised Chirality when moving around legs in Feynman diagrams
added 2 characters in body
Jan
25
awarded  Student
Jan
25
asked Chirality when moving around legs in Feynman diagrams
Jan
21
awarded  Commentator
Jan
21
comment statistics for photon counts in photomultiplier
the absolute variance increases but the 'relative uncertainty' (square root of the variance divided by the number of detected photons) decreases with the square root of the number of detected photons
Jan
21
comment Why do hot objects prefer to emit photons over electrons ? Is there electron-positron annihilation?
good point, it requires more energy to make an electron completely leave the nucleus' electric potential compared to exciting an electron to 'just' a higher energy level from where it can 'relax' again to the original level by emitting a photon.
Jan
11
comment What happens when you heat vodka in a microwave?
that's called distillation
Dec
20
awarded  Editor
Dec
20
revised CERN projects on gravity
added 506 characters in body