Halbwertszeit aus Uran-Aktivität
About points...
We associate a certain number of points with each exercise.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
When you click an exercise into a collection, this number will be taken as points for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit the number of points for the exercise in the collection independently, without any effect on "points by default" as represented by the number here.
That being said... How many "default points" should you associate with an exercise upon creation?
As with difficulty, there is no straight forward and generally accepted way.
But as a guideline, we tend to give as many points by default as there are mathematical steps to do in the exercise.
Again, very vague... But the number should kind of represent the "work" required.
About difficulty...
We associate a certain difficulty with each exercise.
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
When you click an exercise into a collection, this number will be taken as difficulty for the exercise, kind of "by default".
But once the exercise is on the collection, you can edit its difficulty in the collection independently, without any effect on the "difficulty by default" here.
Why we use chess pieces? Well... we like chess, we like playing around with \(\LaTeX\)-fonts, we wanted symbols that need less space than six stars in a table-column... But in your layouts, you are of course free to indicate the difficulty of the exercise the way you want.
That being said... How "difficult" is an exercise? It depends on many factors, like what was being taught etc.
In physics exercises, we try to follow this pattern:
Level 1 - One formula (one you would find in a reference book) is enough to solve the exercise. Example exercise
Level 2 - Two formulas are needed, it's possible to compute an "in-between" solution, i.e. no algebraic equation needed. Example exercise
Level 3 - "Chain-computations" like on level 2, but 3+ calculations. Still, no equations, i.e. you are not forced to solve it in an algebraic manner. Example exercise
Level 4 - Exercise needs to be solved by algebraic equations, not possible to calculate numerical "in-between" results. Example exercise
Level 5 -
Level 6 -
Question
Solution
Short
Video
\(\LaTeX\)
Need help? Yes, please!
The following quantities appear in the problem:
Masse \(m\) / Aktivität \(A\) / molare Masse \(M\) / Stoffmenge \(n\) / Halbwertszeit \(T\) / Zerfallskonstante \(\lambda\) / Anzahl \(N\) /
The following formulas must be used to solve the exercise:
\(A = \lambda \cdot N \quad \) \(T = \dfrac{\ln 2}{\lambda} \quad \) \(m = nM \quad \) \(N = n \cdot N_{\rm A} \quad \)
No explanation / solution video to this exercise has yet been created.
Visit our YouTube-Channel to see solutions to other exercises.
Don't forget to subscribe to our channel, like the videos and leave comments!
Visit our YouTube-Channel to see solutions to other exercises.
Don't forget to subscribe to our channel, like the videos and leave comments!
Exercise:
Die Erfahrung zeigt dass von mg Uran- in einer Sekunde rund num upalpha-Teilchen ausgeset werden. Welche Werte errechnen sich hieraus für die Zerfallskonstante die Halbwertszeit und die mittlere Lebensdauer von Uran-?
Solution:
Die Aktivität beträgt: A fracNt fracnumprs Bq Für die Zerfallskonstante braucht man die vorliege Stoffmenge zu kennen: n fracmM .mol N numpr.e Damit errechnet sich diese einfach: lambda fracAN fracAfracmM N_A .persecond Die Halbwertszeit erhält man direkt aus der Zerfallskonstanten: T fracln lambda .es Die mittlere Lebensdauer des Urans ist: tau fraclambda .es
Die Erfahrung zeigt dass von mg Uran- in einer Sekunde rund num upalpha-Teilchen ausgeset werden. Welche Werte errechnen sich hieraus für die Zerfallskonstante die Halbwertszeit und die mittlere Lebensdauer von Uran-?
Solution:
Die Aktivität beträgt: A fracNt fracnumprs Bq Für die Zerfallskonstante braucht man die vorliege Stoffmenge zu kennen: n fracmM .mol N numpr.e Damit errechnet sich diese einfach: lambda fracAN fracAfracmM N_A .persecond Die Halbwertszeit erhält man direkt aus der Zerfallskonstanten: T fracln lambda .es Die mittlere Lebensdauer des Urans ist: tau fraclambda .es
Meta Information
Exercise:
Die Erfahrung zeigt dass von mg Uran- in einer Sekunde rund num upalpha-Teilchen ausgeset werden. Welche Werte errechnen sich hieraus für die Zerfallskonstante die Halbwertszeit und die mittlere Lebensdauer von Uran-?
Solution:
Die Aktivität beträgt: A fracNt fracnumprs Bq Für die Zerfallskonstante braucht man die vorliege Stoffmenge zu kennen: n fracmM .mol N numpr.e Damit errechnet sich diese einfach: lambda fracAN fracAfracmM N_A .persecond Die Halbwertszeit erhält man direkt aus der Zerfallskonstanten: T fracln lambda .es Die mittlere Lebensdauer des Urans ist: tau fraclambda .es
Die Erfahrung zeigt dass von mg Uran- in einer Sekunde rund num upalpha-Teilchen ausgeset werden. Welche Werte errechnen sich hieraus für die Zerfallskonstante die Halbwertszeit und die mittlere Lebensdauer von Uran-?
Solution:
Die Aktivität beträgt: A fracNt fracnumprs Bq Für die Zerfallskonstante braucht man die vorliege Stoffmenge zu kennen: n fracmM .mol N numpr.e Damit errechnet sich diese einfach: lambda fracAN fracAfracmM N_A .persecond Die Halbwertszeit erhält man direkt aus der Zerfallskonstanten: T fracln lambda .es Die mittlere Lebensdauer des Urans ist: tau fraclambda .es
Contained in these collections
-
Aktivität by pw
-
Aktivität und molare Masse by TeXercises
| Title | Matched on |
|---|---|
| Aktivität von Molybdän | tags |
| Aktivität und Halbwertszeit | tags |
| Anzahl Technetium-Isotope | tags |
| Aktivität von Arsen-Isotop | tags |
| Halbwertszeit und mittlere Lebensdauer | tags |
Similar exercises (17)
| Title | Matched on |
|---|---|
| Aktivität von Molybdän | tags |
| Aktivität und Halbwertszeit | tags |
| Anzahl Technetium-Isotope | tags |
| Aktivität von Arsen-Isotop | tags |
| Halbwertszeit und mittlere Lebensdauer | tags |
| Uran in Mineral | tags |
| Stoffaktivität und mittlere Lebensdauer | tags |
| Aktivität | tags |
| Radiokarbonmethode [per min] | tags |
| Veränderung der Aktivität von Radon | tags |
| Top oder Flop | tags |
| Zerfallskonstante eines Stoffes | tags |
| Radiokarbonmethode [per min] | tags |
| Aktivität von Technetium-Isotopen | tags |
| Top oder Flop | tags |
| Aktivität von Tellur-Probe nach bestimmter Zeit | tags |
| Aktivität von Mangan | tags |