77,471 reputation
178166
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 3 months
seen 13 mins 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.


Apr
17
reviewed Approve suggested edit on Lorentz transformation of electromagnetic 4-potential
Apr
17
awarded  Excavator
Apr
17
reviewed No Action Needed Resonance and a tuning fork
Apr
17
comment Acceleration of electric charges and radiation
possible duplicate of Electromagnetic Radiation of Charged particles
Apr
17
revised Electromagnetic Radiation of Charged particles
Fix link
Apr
17
comment The origin of the colour of the sun
@Eliza: in principle you are emitting a small amount of visible light. I would have to do the calculation to find out how much. WhatRoughBeast is correct to say that true black bodies are rare, but in practice most things have an approximately black body spectrum.
Apr
16
reviewed No Action Needed What properties would the ideal material for spacecraft construction possess?
Apr
16
revised Rubber bands and Hooke's law
edited tags
Apr
16
comment How does measuring redshift make us conclude that rate universe expansion is accelerating?
@RedSirius: we fit the observed red shifts to a mathematical model, and the mathematical model tells us that the expansion is accelerating.
Apr
16
revised How does measuring redshift make us conclude that rate universe expansion is accelerating?
Oops
Apr
16
comment How does measuring redshift make us conclude that rate universe expansion is accelerating?
@Jim: opps yes, thanks. I was mentally adding an extra dot.
Apr
16
comment The origin of the colour of the sun
@Eliza: yes. For example you and I are both emitting black body radiation with a spectrum corresponding to a temperature of 36.8°C (or whatever skin temperature is). The spectrum is related to the temperature by Planck's law.
Apr
16
answered How does measuring redshift make us conclude that rate universe expansion is accelerating?
Apr
16
comment The origin of the colour of the sun
@Eliza: yes, exactly! If you heat your iron to 5,700K then it will produce light with the same spectrum as the Sun (well, it wouldn't because iron would have vaporised at that temperature, but in principle the spectrum would be the same). Black body radiation is a universal phenomenon.
Apr
16
comment The origin of the colour of the sun
@Eliza: yes, your description is basically correct.
Apr
16
answered The origin of the colour of the sun
Apr
16
reviewed Approve suggested edit on Charge by Induction
Apr
16
reviewed Approve suggested edit on Plane Polar coordinates for simple pendulum in moving lift(elevator)
Apr
16
comment Our universe the surface of a 4-dimensional sphere?
The universe can't be the surface of 4D sphere because it's four dimensional. It can't be the surface of a 5D sphere because it's pseudo-Riemannian.
Apr
16
reviewed Approve suggested edit on Was Titanic's captain's decision correct?