Ruthenium-Quelle
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:
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:
Welche Aktivität dürfte eine Ruthenium--Quelle aufweisen damit man tO in ihrer Nähe sein dürfte ohne den gesetzliche frestgelegten Grenzwert HO zu überschreiten? isotopeRu ist ein upbeta^--Strahler mit einem Qualitätsfaktor von qO und EO Zerfallsenergie. Es ist die sicher zu hohe Annahme zu treffen dass nO der Strahlung vom Körper mO gleichmässig absorbiert werden.
Solution:
Geg t tO t H HO H q qO q E_ EO E eta nO n m mO m GesAktivitätAsiBq Gesetzlich darf die Energiedosis D fracHq fracHq D absorbiert werden wofür auf die angegebene Körpermasse sscEa mD m D Ea absorbierte Energie nötig sind. Da dies nur nO entspricht muss die Quelle mindestens sscEt fracsscEaeta fracmDeta fracEan Et Zerfallsenergie abstrahlen. Die Strahlungsleistung der Quelle müsste also P fracsscEtt fracfracmDetat fracmDeta t fracEtt P betragen. Dafür müsste die Aktivität der Probe A fracPE_ fracfracmDeta tE_ fracmDeta tE_ fracPE A sein. A fracmDeta tE_ A
Welche Aktivität dürfte eine Ruthenium--Quelle aufweisen damit man tO in ihrer Nähe sein dürfte ohne den gesetzliche frestgelegten Grenzwert HO zu überschreiten? isotopeRu ist ein upbeta^--Strahler mit einem Qualitätsfaktor von qO und EO Zerfallsenergie. Es ist die sicher zu hohe Annahme zu treffen dass nO der Strahlung vom Körper mO gleichmässig absorbiert werden.
Solution:
Geg t tO t H HO H q qO q E_ EO E eta nO n m mO m GesAktivitätAsiBq Gesetzlich darf die Energiedosis D fracHq fracHq D absorbiert werden wofür auf die angegebene Körpermasse sscEa mD m D Ea absorbierte Energie nötig sind. Da dies nur nO entspricht muss die Quelle mindestens sscEt fracsscEaeta fracmDeta fracEan Et Zerfallsenergie abstrahlen. Die Strahlungsleistung der Quelle müsste also P fracsscEtt fracfracmDetat fracmDeta t fracEtt P betragen. Dafür müsste die Aktivität der Probe A fracPE_ fracfracmDeta tE_ fracmDeta tE_ fracPE A sein. A fracmDeta tE_ A
Meta Information
Exercise:
Welche Aktivität dürfte eine Ruthenium--Quelle aufweisen damit man tO in ihrer Nähe sein dürfte ohne den gesetzliche frestgelegten Grenzwert HO zu überschreiten? isotopeRu ist ein upbeta^--Strahler mit einem Qualitätsfaktor von qO und EO Zerfallsenergie. Es ist die sicher zu hohe Annahme zu treffen dass nO der Strahlung vom Körper mO gleichmässig absorbiert werden.
Solution:
Geg t tO t H HO H q qO q E_ EO E eta nO n m mO m GesAktivitätAsiBq Gesetzlich darf die Energiedosis D fracHq fracHq D absorbiert werden wofür auf die angegebene Körpermasse sscEa mD m D Ea absorbierte Energie nötig sind. Da dies nur nO entspricht muss die Quelle mindestens sscEt fracsscEaeta fracmDeta fracEan Et Zerfallsenergie abstrahlen. Die Strahlungsleistung der Quelle müsste also P fracsscEtt fracfracmDetat fracmDeta t fracEtt P betragen. Dafür müsste die Aktivität der Probe A fracPE_ fracfracmDeta tE_ fracmDeta tE_ fracPE A sein. A fracmDeta tE_ A
Welche Aktivität dürfte eine Ruthenium--Quelle aufweisen damit man tO in ihrer Nähe sein dürfte ohne den gesetzliche frestgelegten Grenzwert HO zu überschreiten? isotopeRu ist ein upbeta^--Strahler mit einem Qualitätsfaktor von qO und EO Zerfallsenergie. Es ist die sicher zu hohe Annahme zu treffen dass nO der Strahlung vom Körper mO gleichmässig absorbiert werden.
Solution:
Geg t tO t H HO H q qO q E_ EO E eta nO n m mO m GesAktivitätAsiBq Gesetzlich darf die Energiedosis D fracHq fracHq D absorbiert werden wofür auf die angegebene Körpermasse sscEa mD m D Ea absorbierte Energie nötig sind. Da dies nur nO entspricht muss die Quelle mindestens sscEt fracsscEaeta fracmDeta fracEan Et Zerfallsenergie abstrahlen. Die Strahlungsleistung der Quelle müsste also P fracsscEtt fracfracmDetat fracmDeta t fracEtt P betragen. Dafür müsste die Aktivität der Probe A fracPE_ fracfracmDeta tE_ fracmDeta tE_ fracPE A sein. A fracmDeta tE_ A
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Dosis Aktivität Zerfallsenergie by TeXercises
Asked Quantity:
Aktivität \(A\)
in
Becquerel \(\rm Bq\)
Physical Quantity
Aktivität \(A\)
Anzahl Kernzerfälle pro Zeit
\( A = \dfrac{\Delta N}{\Delta t}\)
Unit
Becquerel (\(\rm Bq\))
Base?
SI?
Metric?
Coherent?
Imperial?
\(\rm25\,MBq\): Kilogramm Uran
\(\rm10\,kBq\): menschlicher Körper
\(\rm15\,Bq\): Kubikmeter Luft
\(\rm100\,Bq\): Kilogramm Nahrungsmittel