77,296 reputation
178165
bio website ratsauce.co.uk
location Chester, United Kingdom
age 53
visits member for 3 years, 3 months
seen 49 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.


1h
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.
1h
answered How do we know that the universe expansion is accelerating?
1h
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.
2h
comment Uncertainty of permittivity of vacuum
possible duplicate of Coulomb's Law: why is $k = \dfrac{1}{4\pi\epsilon_0}$
2h
comment The origin of the colour of the sun
@Eliza: yes, your description is basically correct.
3h
answered The origin of the colour of the sun
3h
reviewed Approve suggested edit on Charge by Induction
4h
reviewed Approve suggested edit on Plane Polar coordinates for simple pendulum in moving lift(elevator)
4h
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.
4h
reviewed Approve suggested edit on Was Titanic's captain's decision correct?
4h
reviewed Approve suggested edit on Was Titanic's captain's decision correct?
4h
reviewed No Action Needed Why do electrons around nucleus radiate light according to classical physics
4h
reviewed No Action Needed How do we know that the universe expansion is accelerating?
4h
reviewed Close Calculate speed of proton at infinity
4h
reviewed Close Waveguide in TE mode. Power guided
4h
reviewed Close Plane Polar coordinates for simple pendulum in moving lift(elevator)
4h
reviewed Close Three-plate capacitor
4h
reviewed Approve suggested edit on Parity transformation of polarization vectors
4h
reviewed Approve suggested edit on Why do electrons around nucleus radiate light according to classical physics
20h
reviewed Close Thermodynamic Processes