Pre-Lab Questions: . 1. Define nuclear decay. Energy is release and nucle of a 2 lunch 2. Define half-life:Half life is when sond in 30 though a process 3. Why do you think pennies) make a good analogy for nuclear decay? each one only equals, one Bent and it's sponsone by the flip a coin Ilypothesis: If we model radioactive decay, then % of the remaining original "nuclei" will decay with each trial 4. Total time Procedure: 1. Retrieve your sample of isotopes (Pennium) from your teacher Count the total number of pennies. Record the # for hall-life 0. 3. Shake all of the pennies in your hand for 20 seconds (this is the life of pennium). Drop the pennies on to your la surface and take out any pennies that are tails up (decayed atoms) 5. Count the TOTAL number of nuclei that decayed and record this data in your table. Do NOT place these isotop with the other pennies. Set them to the side. 6. Count the number of nuclei that have NOT decayed and record this in your data table. Shake the heads up penn in your hand and repeat steps 3 to 6 until ALL isotopes have decayed. 3 7. For each trial, calculate the percentage that decayed using this formula: Data: % decayed = (#decayed - total # of isotopes) x 100 #of Isotopes # of Isotopes % of Decay (seconds) Undecayed Decayed O seconds 120 sec, 23 29 40 sec 8 15 28.2% 3 5 3 37.5% 2 3. Gon 5 100sec 2 6 Igosec 2 02 o n Lola Conclusions: Half- Life 0 0 1 55,807 2 160 sec 180 suc 4 odnos 1007, 7 1. How did your results compare to the hypothesis above? It was somewhat close a. Does exactly the same fraction of pennium atoms decay during each half-life? b. What does this suggest about half-life? c. Why are such variations not likely to be obvious when actual atoms are involved? Atoms are smart to see a reaction a 2. How long would you expect it to take a 500 piece sample to completely decay? 5730 years Pre-Lab Questions: . 1. Define nuclear decay. Energy is release and nucle of a 2 lunch 2. Define half-life:Half life is when sond in 30 though a process 3. Why do you think pennies) make a good analogy for nuclear decay? each one only equals, one Bent and it's sponsone by the flip a coin Ilypothesis: If we model radioactive decay, then % of the remaining original "nuclei" will decay with each trial 4. Total time Procedure: 1. Retrieve your sample of isotopes (Pennium) from your teacher Count the total number of pennies. Record the # for hall-life 0. 3. Shake all of the pennies in your hand for 20 seconds (this is the life of pennium). Drop the pennies on to your la surface and take out any pennies that are tails up (decayed atoms) 5. Count the TOTAL number of nuclei that decayed and record this data in your table. Do NOT place these isotop with the other pennies. Set them to the side. 6. Count the number of nuclei that have NOT decayed and record this in your data table. Shake the heads up penn in your hand and repeat steps 3 to 6 until ALL isotopes have decayed. 3 7. For each trial, calculate the percentage that decayed using this formula: Data: % decayed = (#decayed - total # of isotopes) x 100 #of Isotopes # of Isotopes % of Decay (seconds) Undecayed Decayed O seconds 120 sec, 23 29 40 sec 8 15 28.2% 3 5 3 37.5% 2 3. Gon 5 100sec 2 6 Igosec 2 02 o n Lola Conclusions: Half- Life 0 0 1 55,807 2 160 sec 180 suc 4 odnos 1007, 7 1. How did your results compare to the hypothesis above? It was somewhat close a. Does exactly the same fraction of pennium atoms decay during each half-life? b. What does this suggest about half-life? c. Why are such variations not likely to be obvious when actual atoms are involved? Atoms are smart to see a reaction a 2. How long would you expect it to take a 500 piece sample to completely decay? 5730 years