TeXercises.com

Kalium in einer Banane

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.

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 -

Exercise

https://texercises.com/exercise/kalium-in-einer-banane/

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 \(N\) / Verhältnis / Anteil \(\eta\) /

The following formulas must be used to solve the exercise: \(A = \lambda \cdot N \quad \) \(\eta = \dfrac{a}{A} \quad \) \(T = \dfrac{\ln 2}{\lambda} \quad \) \(m = nM \quad \)

Hide help

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!

Exercise:
%http://sirzwieback.blogspot.ch///achtung-radioaktiv.html Eine durchschnittliche Banane enthält .sig Kalium davon sind .% K- das eine Aktivität von siBq verursacht. Rechnen Sie nach ob diese Zahlen zusammenpassen indem Sie aus der Aktivität die Anzahl K- Atome bestimmen und diese Zahl vergleichen mit der Anzahl K- Atome die man aus den .sig mit dem Prozentsatz erhält.

Solution:
A lambda N_ fracln T_/ N_ Rightarrow N_ fracA T_/ln fracsiBq .eeesia .eeesis/aln uuline.eee N_ fracfmm_a frac.% .eesikg% .siu .eesikg/u uulineeee Im Rahmen der Rechengenauigkeit -- eine respektive zwei bedeutsame Ziffern -- herrscht Übereinstimmung.

Meta Information

\(\LaTeX\)-Code

Contained in these collections:

Aktivität Banane by TeXercises

5 | 5
Kern- und Teilchenphysik: Radioaktivität by Lie

17 | 50

Attributes & Decorations

Tags	K40Banane
Content image
Difficulty	(1, default)
Points	0 (default)
Language	(Deutsch)
Type	Calculative / Quantity
Creator	Lie
Decoration
File
Link