95,478 reputation
3132239
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 6 months
seen 3 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.


Feb
27
reviewed Approve suggested edit on Taking pivot about an accelerating point
Feb
27
reviewed Leave Closed What are characteristic ranges of time, distance, energy regions for physics and chemistry?
Feb
27
reviewed Close Electric field produced by a charged ring
Feb
27
reviewed Leave Open what is the best way to collimate light emitted by a led?
Feb
27
reviewed Close Charging 12V 150Ah battery
Feb
27
comment Why is the magnetic field proportional to distance?
@Key: I have no idea I'm afraid.
Feb
26
revised Why does a magnetic field raise the ground state energy of an electrical particle?
Correct typo
Feb
26
reviewed Leave Open Pressure applied to flat plate
Feb
26
comment Why does a magnetic field raise the ground state energy of an electrical particle?
Related: Is there a physical intuition for diamagnetic inequality?
Feb
26
reviewed Approve suggested edit on Is the uncertainty principle axiomatic or derived?
Feb
26
comment Why isn't steam/cloud blue like liquid and solid water?
@user38220: The only spectrum of water vapour I could find is here. From this it looks as if the absorption starts around 750nm, which is out of the visible range. So water vapour would not have a blueish colour. It's hard to be certain though without a better quality spectrum.
Feb
26
reviewed Approve suggested edit on Electrical Potential Energy And forces Experienced By Particles
Feb
26
comment SR time dilation
@user41266: Do you agree that each clock would see the other ticking more slowly? No. They would see the other clock tick more slowly while they were coasting but faster while they were accelerating, and the two effects would cancel out leaving the clocks the same. The observers have to accelerate in the experiment you describe because they start at rest and end at $0.4c$. Like all varients of the twin paradox, you have to include the acceleration phase to get the correct result.
Feb
26
reviewed No Action Needed Why do the passing objects' shadows run in the direction of the moving train?
Feb
26
reviewed No Action Needed What was Feynman's “much better way of presenting the electrodynamics” — which did **not** appear in the Feynman lectures?
Feb
26
reviewed Close Is it possible that there is no theory of quantum gravity?
Feb
26
comment What is drift velocity? And how to find the equation for it?
I would guess there's no significance to the use of the word speed rather than velocity. Many of us are casual about this when the direction is obvious (i.e. along the wire).
Feb
26
comment What is drift velocity? And how to find the equation for it?
en.wikipedia.org/wiki/Drift_velocity. You might wish to read through this and edit your question to address any specific points arising from it.
Feb
26
comment How to calculate how many can a stick hold?
engineersedge.com/beam_calc_menu.shtml
Feb
26
reviewed Approve suggested edit on Does electron in wave form have mass?