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Cobalt-Präparat der Schule

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/cobalt-praparat-der-schule/

Question

Solution

Short

Video

\(\LaTeX\)

Cobalt-60
uz, , 2024, digital photograph, TeXercises

Need help? Yes, please!

The following quantities appear in the problem: Zeit \(t\) / Masse \(m\) / Arbeit \(W\) / Energie \(E\) / Aktivität \(A\) / Leistung \(P\) / Äquivalentdosis \(H\) / Zerfallskonstante \(\lambda\) / Anzahl \(N\) / Energiedosis \(D\) /

The following formulas must be used to solve the exercise: \(A = \lambda \cdot N \quad \) \(D = \dfrac{E}{m} \quad \) \(P = \dfrac{E}{t} = \dfrac{W}{t} \quad \) \(P = A \cdot E_1 \quad \) \(H = qD \quad \)

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Exercise:
Der bei uns an der Schule verwete Cobalt--Strahlerstift hat AO Aktivität. isotopeCo set schnell hereinander zwei upgamma-Strahlen mit EaO und EbO aus. Wie lange könnte man sich mO neben dem Stift aufhalten bis die HO gesetzlicher Grenzwert erreicht wären falls man ntO der Strahlung gleichmässig auf den Körper absorbieren würde?

Solution:
Um die HO Äquivalentdosis mit upgamma-Strahlung zu erreichen wären D fracHq fracHq D Energiedosis nötig. Auf den Körper verteilt müsste man demnach E' mD mfracHq m D E totale Energie absorbieren wozu der Strahlerstift E fracE'eta fracmfracHqeta fracmHeta q fracEnt Ep Bei der vom Präparat abgegebenen P A E_ A E_a + E_b A Ea + Eb P Strahlungsleistung würde das t fracEP fracfracmHeta qA E_a + E_b fracmHeta qA E_a + E_b fracEpP t approx tcQ dauern. t fracmHeta qA E_a + E_b tcQ

Meta Information

\(\LaTeX\)-Code

Contained in these collections:

Dosis Aktivität Zerfallsenergie by TeXercises

5 | 7

Asked Quantity: Zeit \(t\) in Sekunde \(\rm s\)

Attributes & Decorations

Tags	becquerel, biologie, dosimetrie, kernphysik, nuklearphysik, physik, präparat, radioaktivität, strahlerstift
Content image	Cobalt-60
Difficulty	(3, default)
Points	4 (default)
Language	(Deutsch)
Type	Calculative / Quantity
Creator	uz
Decoration
File
Link

Physical Quantity

Zeit \(t\)

Die Zeit beschreibt die Abfolge von Ereignissen, hat also eine eindeutige, nicht umkehrbare Richtung.

Sekunde (\(\rm s\))

Unit

Sekunde (\(\rm s\))

Seit 1967 ist eine Sekunde das 9.192.631.770-fache der Periodendauer der Strahlung, die dem Übergang zwischen den beiden Hyperfeinstrukturniveaus des Grundzustandes von Atomen des Nuklids 133Cs entspricht.

Umlaufzeit (\(T\))

Halbwertszeit (\(T\))

Lebensdauer (\(\tau\))

Schwingungsdauer (\(T\))

Zeit (\(t\))

\(\rm 1\,min=60.0\,s\)

\(\rm 1\,h=3.6\cdot 10^{3}\,s\)

\(\rm 1\,d=8.64\cdot 10^{4}\,s\)

\(\rm 1\,a=3.154\cdot 10^{7}\,s\)

Base? SI? Metric? Coherent? Imperial?