Glossary entry

French term or phrase:

il s'agit de l'hypothèse à tester

English translation:

this is the hypothesis that needs to be tested

Added to glossary by Bertrand Leduc
May 30, 2012 08:25
11 yrs ago
9 viewers *
French term

il s'agit de l'hypothèse à tester

French to English Science Physics Definition of stimulated emission
Everything was fine until I got to the item in question. Of course it's not a problem to translate, but I just don't see what it's doing there - there suddenly comes parachuting down the idea that the hypothesis is being tested.
Any ideas?

Émission stimulée

La vision classique de l'émission stimulée consiste à dire que l'électron peut absorber un photon (avec une probabilité associée au coefficient d'absorption d'Einstein).
Il s'ensuit deux possibilités :

Soit l'électron réémet de façon spontanée et isotrope un photon.
On parle alors d'émission spontanée qui est se produit avec une certaine probabilité associée à une constante de temps.
Comme l'électron est libre (non lié à un atome), l'absorption du photon est couplée à un continuum d'énergie dans l'espace des phases de l'électron.
Il s'ensuit que l'électron peut éventuellement réémettre un photon dans un état différent du photon incident.

Soit l'électron entre en collision avec un autre photon qui provoque l'émission de photons jumeaux.
On parle alors d'émission stimulée, et **il s'agit de l'hypothèse à tester**.
Selon les coefficients d'Einstein, il s'ensuit que cette voie de réémission devrait être très dominante par rapport à l'émission spontanée.
Change log

Apr 16, 2013 06:31: Bertrand Leduc Created KOG entry

Discussion

Wolf Draeger Jun 8, 2012:
Lol, Chris - an excellent source of renewable energy, I'd say! Now there's a hypothesis worth testing ;-)
chris collister Jun 8, 2012:
We have electons coming up this weekend - though il s'agit mostly d'émissions de hot air
Timothy Lemon Jun 8, 2012:
An electon may absorb a photon. When it does it may emit a photon by either stimulated emission or spontaneous emission. It's a question of distinguishing between the two possibilities.
Wolf Draeger May 30, 2012:
Theoretical basis for experiment (known outcome) This sounds a little like a high-school textbook outlining the theoretical basis for conducting an experiment of which the outcome is already known; so, first the ideas behind spontaneous & stimulated emission are laid out, followed by the experiment itself (in this case, on stimulated emission).

One could perhaps then interpret the phrase as "and this is the theory we are (now) going to test".

Does the context allow for this?
claude-andrew (asker) May 30, 2012:
Yes, 'hypothèse" always needs to be interpreted in context. I'm still hesitating.
chris collister May 30, 2012:
"hypothèse" often has the meaning of "assumption", so perhaps he's saying that the assumption of stimulated emission remains to be tested?

Proposed translations

+7
37 mins
Selected

and this is the hypothesis that needs to be tested

I think that it should be hypothesis, as hypotheses are individual testable opinions; while theories are collections of hypotheses that are logically linked together into a coherent explanation of some aspect of reality and which have individually or jointly received some empirical support.
Peer comment(s):

agree Tony M : Yes, I think you're right! I wans't entirely sure exactly which was the actual hypothesis in question, but I think I'm getting a clearer idea now.
4 mins
Thanks Tony!
agree Cyril B.
21 mins
Thanks Cyril!
agree B D Finch : Or even a mere "assumption"?
25 mins
Thank you!
agree Tristan Jimenez
1 hr
Merci Tristan!
agree Dr Lofthouse
3 hrs
Thank you!
agree Timothy Lemon
4 hrs
Thank you!
agree Andrew47 : Hypothesis is definately the correct word here. And I agree with Wolf Draeger that this a high school/undergraduate text.
15 hrs
Thanks Andrew!
Something went wrong...
4 KudoZ points awarded for this answer. Comment: "Selected automatically based on peer agreement."
+4
12 mins

and this is the theory that needs to be tested

Well, unless I'm missing something, that seems to be the idea, and I don't see why it doesn't fit in your context?

The first idea is well known and has been provien, while the second is only a theory, and more testing needs to be done on this.

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Note added at 30 mins (2012-05-30 08:55:32 GMT)
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Or of course 'assumption' as Chris quite rightly says.

From the rest of the text, it does indeed seem to be the case that this latter notion has yet to be fully proven...
Note from asker:
Yes, I didn't know that the fact that the second idea is only a theory - if this is the case, then indeed there's no problem. And I suppose it IS the case since they say so!
Peer comment(s):

agree ATP522
3 mins
Thanks, ATP!
agree Savvas SEIMANIDIS
16 mins
Efharisto, Savvas!
agree Bashiqa
24 mins
Thanks, Chris!
agree Cyril B.
39 mins
Merci, Cyril !
neutral B D Finch : Assumption or hypothesis, rather than "theory".
50 mins
Thanks, B.! :-)
Something went wrong...
37 mins

involves hypothesis testing

http://www.google.co.uk/search?q=On parle alors d'émission s...

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Note added at 41 mins (2012-05-30 09:06:46 GMT)
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Scientific Hypothesis, Theory, Law Definitions
chemistry.about.com/od/chemistry101/a/lawtheory.htm
Learn about the difference between a scientific law, hypothesis, and theory.
Peer comment(s):

neutral Tony M : I don't think 'invovles' really works here in the source text as given.
6 mins
Something went wrong...

Reference comments

13 hrs
Reference:

Spontaneous & Stimulated emission

I'm no expert in physics, so this is not an authoritative entry at all. But I understand claude-andrew's confusion; the two theories don't contradict one another, there is no choice to be made, no test to determine which is valid and which isn't. Unless the text is out of date?
Note from asker:
Exactly, Wolf (and a number of other definitions in the document are out of date). Of course I've searched around for the latest situation, but to no avail. It looks as though the choice is simply between 'hypothesis', 'theory' and assumption'
Something went wrong...
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