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<quiz>
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  <question type="category">
    <category>
      <text>top/6 Moderne Physik</text>
    </category>
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    <idnumber></idnumber>
  </question>

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  <question type="category">
    <category>
      <text>top/6 Moderne Physik/Radioaktivität</text>
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      <text></text>
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    <idnumber></idnumber>
  </question>

<!-- question: 8127  -->
  <question type="formulas">
    <name>
      <text>Änderung Ordnungs- und Massenzahl bei mehreren Zerfällen</text>
    </name>
    <questiontext format="html">
      <text><![CDATA[<p>Ein bestimmtes Nuklid zerfällt in mehreren Schritten und sendet dabei nacheinander {nAlpha} Alpha-Teilchen und {nBeta} Beta-{strSignBeta}-Teilchen aus. Wie verändern sich in dieser Zerfallskette insgesamt die Ordnungszahl und die Massenzahl?</p><br>]]></text>
    </questiontext>
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      <text></text>
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      <text>Your answer is correct.</text>
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      <text>Your answer is partially correct.</text>
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      <text>Your answer is incorrect.</text>
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<varsrandom><text>nAlpha = {1,2,3,4};
nBeta = {1,2};
jSignBeta = {0,1};</text>
</varsrandom>
<varsglobal><text><![CDATA[strSignBeta = ["Minus", "Plus"][jSignBeta];
numSignBeta = [-1, +1][jSignBeta];

solDeltaZ = -2 * nAlpha - 1 * (numSignBeta) * nBeta;
solDeltaA = -4 * nAlpha;]]></text>
</varsglobal>
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<answers>
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  <text>1</text>
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 <numbox>
  <text>1</text>
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 <vars1>
  <text></text>
 </vars1>
 <answer>
  <text>solDeltaZ</text>
 </answer>
 <vars2>
  <text></text>
 </vars2>
 <correctness>
  <text><![CDATA[_err < 0.1]]></text>
 </correctness>
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  <text>0.2</text>
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  <text>1</text>
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<text><![CDATA[<p>&emsp;\(\Delta Z=\;\){_0}</p>]]></text>
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<answers>
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  <text>1</text>
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  <text>1</text>
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  <text>0</text>
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  <text>1</text>
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 <vars1>
  <text></text>
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 <answer>
  <text>solDeltaA</text>
 </answer>
 <vars2>
  <text></text>
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 <correctness>
  <text><![CDATA[_err < 0.1]]></text>
 </correctness>
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  <text>0.2</text>
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  <text>1</text>
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  <text></text>
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<text><![CDATA[<p>&emsp;\(\Delta A=\;\){_0}</p>]]></text>
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<text></text>
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</answers>
  </question>

<!-- question: 8128  -->
  <question type="formulas">
    <name>
      <text>Dauer mehrerer Halbwertszeiten</text>
    </name>
    <questiontext format="html">
      <text><![CDATA[<p>Zu einem bestimmten Zeitpunkt liege eine gewisse Menge an {strNuklid} Kernen vor. Nach wie vielen Tagen ist nur noch {strRest} der Kerne vorhanden?</p>]]></text>
    </questiontext>
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      <text></text>
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    <penalty>0.3333333</penalty>
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    <idnumber></idnumber>
    <correctfeedback format="markdown">
      <text>Your answer is correct.</text>
    </correctfeedback>
    <partiallycorrectfeedback format="markdown">
      <text>Your answer is partially correct.</text>
    </partiallycorrectfeedback>
    <incorrectfeedback format="markdown">
      <text>Your answer is incorrect.</text>
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    <shownumcorrect/>
<varsrandom><text>jZeit = {0:4};
jNuklid = {0:11};</text>
</varsrandom>
<varsglobal><text><![CDATA[strNuklid = ["U-230", "U-231", "U-237", "Pa-230", "Pa-232", "Th-227", "Th-234", "Ac-225", "Ac-226", "Ra-223", "Ra-224"][jNuklid];
numHalbwertszeit = [20.8, 4.17, 6.75, 17.4, 1.32, 18.7, 24.1, 9.95, 1.22, 11.4, 3.63][jNuklid];

strRest = ["1/8", "1/16", "1/32", "1/64"][jZeit];
numZeit = [3, 4, 5, 6][jZeit];

solZeit = numZeit * numHalbwertszeit;]]></text>
</varsglobal>
<answernumbering><text>none</text>
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<answers>
 <partindex>
  <text>0</text>
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 </placeholder>
 <answermark>
  <text>3</text>
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 <answertype>
  <text>0</text>
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 <numbox>
  <text>1</text>
 </numbox>
 <vars1>
  <text>nSigFig = 3;
origSol = solZeit;
sol = sigfig( origSol , nSigFig );</text>
 </vars1>
 <answer>
  <text>sol</text>
 </answer>
 <vars2>
  <text></text>
 </vars2>
 <correctness>
  <text><![CDATA[_relerr < 0.01]]></text>
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 <unitpenalty>
  <text>0.2</text>
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  <text>1</text>
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<text><![CDATA[<p>&emsp;{_0}&ensp;\(\mathrm{d}\)&emsp; (Angabe mit {nSigFig} signifikanten Stellen ohne Einheit)</p>]]></text>
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  </question>

</quiz>