Questions: 1. The \'h lfe value is obtained from the plot of \"Number of Undecay
ID: 1886101 • Letter: Q
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Questions: 1. The 'h lfe value is obtained from the plot of "Number of Undecayed Atoms vs Time". Explain if you can read the number 23.345 pennies to 5 significant figures using your graph. estimated value What is the ? H life value based on your ow many significant figures can be kept in the % graph? 2. The life is read off the graph. When preparing the "Number of Undecayed Atoms vs Time graph x axis, do you need to take care that the following x-axis data points are placed on a grid line: 50 pennies, 25 pennies, 12.5 pennies? If the location of 50 pennies is estimated, how is the k accuracy affected? Explain your answer. 3. The standard deviation is measure of the precision of the data. Precision is how close the individual data points are to each other and provides a range in which the true value is expected to occur. a. Show the average range by adding and subtracting the standard deviation from the averge. y life +/ deviation: 10.65+03lbt10.b5+0.l61 1.233re 11. 064see 10.lo5-0.81b4- Average 12 life range: Minimum Maximum - b. Compare your % life determination to the average range. Is your 12 life determination withirn or outside of the range? Your ½ life determination-11 Seconde 0u,'la Lile determination within the ronge 4. The 2 life is the time for 2 of the sample to decay. a. Using your graph and 100 pennium atoms initially, how much time was required for % of the 100 pennium atoms to decay? Use your graph to determine how much time was required for %Explanation / Answer
1. The smallest minor tick along Y axis is 1 so it is not possible to read 23.345. You can either read 23 or 24.
Now half life is the time it takes to deacy half of its initial qunatity. Here initially 100 atoms so 50 remains after a time of 11 s. So half life is 11 s.
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