133 reputation
18
bio website flunzel.de
location Germany
age 38
visits member for 3 years, 6 months
seen 16 hours ago
  • Student of CS ... and sometimes Physics (reluctant)
  • C#-Developer (part time)
  • LPC-for-fun-programmer (see Multi User Dungeon)

Aug
7
comment Can light emitting diodes be used to generate UV wavelengths?
@Einar For me being completely wrong you seem to admit me being right a lot in your fourth paragraph. OP asked about LED-array with shiftable wavelength in UV.
Aug
7
comment How much solar energy hits a rooftop in Israel?
@Lagerbaer And that already includes heavy subsidies.
Aug
7
comment How Earth communicates with Voyager I?
Some data on antenna power/gain of Voyager 2 can be found here.
Aug
4
comment How can a laser pointer have range of several kilometers in atmosphere?
This is more about luminance than simply power. Your question could be rephrased to "why can I see a candle from several kilometers away in the night". The radial distribution of the light "eats" a lot more than clear air absorbs but still enough light reaches your eye to be made out (take a look at the stars, their power is enormous but your candle is brighter: it is not about power alone). Enter absorbers like fog/clouds and you won't see the candle/star/laser/sun ... or mountain/moon/landscape anymore.
Aug
2
comment Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
@Georg Don't hesitate to add the appropriate links to these threads at OPs question or mark the question as whole as duplicate. That is how stackexchange usually works. (Don't blame me and my comment for not noticing these duplicates, you can clearly see that I'm more of a passive reader here.)
Aug
1
revised Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
added estimation formula
Aug
1
revised Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
adjusted chemics ;)
Aug
1
revised Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
elaboration
Aug
1
comment Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
My answer is specifically directed at the last part of OPs question.
Aug
1
revised Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
"thermonuclear" was the wrong word: I wanted to emphasize that the operation method is the weakness
Aug
1
awarded  Commentator
Aug
1
revised Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
added 142 characters in body
Aug
1
answered Without a reactor vessel breach, how does radiation build-up in containment buildings of troubled nuclear reactors?
Jun
24
awarded  Citizen Patrol
Mar
30
revised Problem deriving kinetic energy from work
edited body
Mar
30
awarded  Scholar
Mar
30
comment Problem deriving kinetic energy from work
@Ted Sorry, the $\vec{K}$ was just a leftover from me translating the german Kraft to Force.
Mar
30
accepted Problem deriving kinetic energy from work
Mar
30
comment Problem deriving kinetic energy from work
@Mark That is a bone you would have to pick with the author (Hermann Schulz, Hannover). He claims that a clearly defined $\delta_x$ is (in this case) clear enough to be used instead of the total $\frac{d}{dx}$ because you always have to understand what you derive there and not only apply symbols. It is known that $\vec{r}$ depends on time.
Mar
30
awarded  Student