135,981 reputation
9228377
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 4 months
seen 2 hours ago

Semi retired old time computer nerd who started programming on a Commodore Pet.

Since I'm also active in the Physics forum I should add that I started as a theoretical chemist, moved into solid state photochemistry and finally worked in industry as a colloid scientist. I only became a full time computer nerd in 1997.


16h
awarded  Nice Answer
17h
comment Neutron antineutron reaction documentation
Hi Jimmy. You're welcome to use the picture. Anything posted on the SE accepts the creative commons licence, and I'm perfectly happy with this or I wouldn't be posting here. The answer the picture came from mentions antineutron-neutron annihilation only in passing, so it isn't an answer to this question, but I would have mentioned it as a starting point then gone on to give a more detailed account of antineutron-neutron observations.
17h
comment Neutron antineutron reaction documentation
Hmm, that picture that you've used without attribution looks awfully familiar.
1d
reviewed No Action Needed Magnetic field outside an infinite solenoid
1d
comment Trajectories in Rindler space with zero net time dilation
A range from 0.01c upwards. Accelerations in the range 1g to 10g.
1d
comment Trajectories in Rindler space with zero net time dilation
@JimtheEnchanter: the calculation of $\tau$ is not an approximation. The curve I'm using is only approximately similar to a geodesic but the calculation of the proper time works for any curve, whether the curve is a geodesic or not, so my result is robust. In any case, it's the net dilation that is zero. When you do the integration $\tau$ first falls behind $t$, then catches and passes it, then $t$ catches up with $\tau$ again so they finish neck and neck.
1d
asked Trajectories in Rindler space with zero net time dilation
1d
reviewed No Action Needed A conducting metal cylinder enters a region of magnetic field
1d
reviewed No Action Needed How does warped space actually look (visually)?
1d
comment Why does a circle of light form around a wire when a laser is pointed at it?
Hi Macro. That is not a quantitative argument.
1d
comment Long, blurry reflections in wet road
possible duplicate of a weird image of sun
1d
comment How long does it take a magnet to lose its magnetization?
possible duplicate of How long does a permanent magnet remain a magnet?
1d
comment Find the fraction of atoms in specific quantum state in stellar atmosphere
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
1d
answered Measuring image distance of a virtual image
1d
comment What does this problem about lenses really want?
Because we don't encourage questions about homework.
1d
comment What does this problem about lenses really want?
Right. And now you know everything you need to answer the question.
1d
comment Origin of inflation
Hi Dan. For anyone to take your theory seriously you need to express it in mathematical form showing what assumptions you make and how the mathematical analysis leads to inflationary expansion.
1d
comment What does this problem about lenses really want?
Objects at infinity form an image at the focal length, so I interpret the question to mean that the focal length of the lens is 40mm.
1d
comment What does this problem about lenses really want?
Hi and welcome to the Physics SE! Please note that this is not a homework help site. Please see this Meta post on asking homework questions and this Meta post for "check my work" problems.
1d
reviewed Approve Proving independence of the lagrangian on position of a free particle using the euler-lagrange equation