349 reputation
25
bio website github.com/tvwerkhoven
location Netherlands
age 29
visits member for 2 years, 9 months
seen Dec 24 '12 at 8:53

I use programming for work and I find StackOverflow a very useful resource for when things go wrong.


Nov
30
awarded  Enlightened
Nov
30
awarded  Nice Answer
Jul
21
awarded  Yearling
Aug
8
comment How can a laser pointer have range of several kilometers in atmosphere?
You're right, I had some things mixed up. But I fail to see why this does not apply to coherent light. Even laser beams diverge (slightly) and thus decay with $1/r^2$.
Aug
8
comment How can a laser pointer have range of several kilometers in atmosphere?
In a vacuum (which space is not), light travels more or less uninterruptedly. But because of non-zero divergence of any beam, the 'brightness' will slowly go to zero.
Aug
8
answered How can a laser pointer have range of several kilometers in atmosphere?
Aug
8
comment How can a laser pointer have range of several kilometers in atmosphere?
As far as I know that's not correct, only beams that illuminate the whole unit sphere ($4\pi$ steradian) lose 'intensity' with $1/r^2$. The difference is in the divergence of the beams, the more convergent the beams are, the less they lose 'intensity' ('intensity' is a bit tricky here because there are various units that can be used).
Jul
29
revised Could a human run horizontally inside a Wall of Death?
typeset math using $$
Jul
29
suggested suggested edit on Could a human run horizontally inside a Wall of Death?
Jul
28
comment Roughly how many atoms thick is the layer of graphite left by a pencil writing on paper?
I don't claim this is an accurate answer, the weakest part is very probably the maximum surface a pencil can write. I couldn't find any better estimates that quickly, so I settled for this. This answer is more about the method than the actual answer, with better data you can easily update the estimate.
Jul
26
answered Roughly how many atoms thick is the layer of graphite left by a pencil writing on paper?
Jul
25
answered Finding the max height of a ball launched as a projectile using work-energy
Jul
25
comment number of electrons my laptop uses in a second
Also note that the input electricity is AC, so the number of electrons passing through any circuit is time-variable.
Jul
25
answered Maximal Gravity
Jul
22
comment Light Energy Absorption In Mirror
1) this lacks necessary detail to solve the question, 2) this sounds somewhat like homework...
Jul
21
awarded  Supporter
Jul
21
answered Projecting image without manual focussing
Jul
21
awarded  Editor
Jul
21
revised Is apparent horizon curvature lesser due to refraction of light in the atmosphere?
clarification
Jul
21
comment Is apparent horizon curvature lesser due to refraction of light in the atmosphere?
That's a somewhat more concise way of putting it, yes ;)