133,344 reputation
8224370
bio website ratsauce.co.uk
location Chester, United Kingdom
age 54
visits member for 4 years, 3 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.


Jan
25
comment Why does a gold leaf appear blue if made very thin?
@21joanna12: I've edited my answer to respond to your comment.
Jan
25
revised Why does a gold leaf appear blue if made very thin?
Respond to comment
Jan
25
comment Do right angles occur in Nature?
The $p_x$, $p_y$ and $p_z$ atomic orbitals are at 90 degrees to each other.
Jan
25
reviewed Approve Arrow that changes direction home experiment
Jan
25
answered Why does a gold leaf appear blue if made very thin?
Jan
25
answered Absolute (as opposed to relative) concept of inertial frame
Jan
25
answered Arrow that changes direction home experiment
Jan
25
comment Coordinates for FLRW metric
I'm afraid it isn't clear to me what you mean. Can you rephrase your question in a more mathematical way to clarify exactly what you're asking? Are you comparing the different interpretations of the expansion given by comoving coordinates and "everyday" coordinates?
Jan
25
reviewed Leave Open Understanding Tensor Product
Jan
25
comment One dimensional motion problem
Galilean relativity
Jan
25
comment One dimensional motion problem
Divide the initial separation by the relative speed
Jan
25
comment Is the oscillation of all particles for stationary wave equal?
Assuming you mean a standing wave, then you are quite correct. The particles at a node are stationary.
Jan
25
reviewed No Action Needed Gas compressed and cooled
Jan
25
answered Does the escape velocity of a black hole exceed $c$ *before* a singularity is created?
Jan
25
comment Does the payload of an Alcubierre drive have to be on board during the preparation phase?
Why do you say the destination doesn't have to be in the forward light cone? The whole point of FTL drives like the Alcubierre drive is that the destination can be spacelike separated.
Jan
25
comment What evidence is there for quantum leaps?
You might also be interested to read physics.stackexchange.com/questions/142373/…, physics.stackexchange.com/questions/130116/… and physics.stackexchange.com/questions/95211/… as these cover related issues.
Jan
25
reviewed Leave Closed Klein-Gordon field commutator integral identity
Jan
25
reviewed No Action Needed Acoustics - Phased Arrays
Jan
25
reviewed Close In what way can a Solar storm hitting the Earth disrupt electronic equipment
Jan
25
reviewed Leave Open Calculating the flex of a solid bar under force