Half-Life of M&Ms
Introduction
Half-life is the time required for something to fall to half its initial value. The half-life of a radioactive element is the time it takes for half of its atoms to decay into something else. M&Ms were chosen because they all have the same m mark on the on one side. In this lab you will go through predicting and counting the number of remaining "mark-side up" candies that should help understand that rates of decay of unstable nuclei and how it can be measured; that the exact time that a certain nucleus will decay cannot be predicted; and that it takes a very large number of nuclei to find the rate of decay. Purpose

To stimulate the transformation of a radioactive isotope with M&Ms over time and to graph the data and relate it to radioactive decay and half-lives. Materials and Safety

Materials
* 200 pieces of M&Ms (trademark only)
* Shoe Box
* Pen/Pencil
* Paper Towel

Safety- No safety precautions needed

Procedure
1. Count out 200 M&Ms. Place all 200 candies in the shoe box with the letter facing up 2. Cover the box and shake it vigorously for 3 sec. This is 1 time interval. 3. Remove the lid and take out any atoms (candies) that have “decayed”, that is, that are now showing lettered sides down. Record on the data table the numbers of decayed and remaining atoms. 4. Replace the cover on the box, and shake for another 3-sec time interval. Record the number of “radioactive’ atoms remaining. 5. Keep repeating time interval trials until all atoms have decayed or you have reached 30 sec on the data table 6. Repeat the whole experiment a second time, and record all data. 7. Average the number of atoms left at each time interval from both trial. Make a graph of your data showing the average number of atoms remaining versus time

...July 8, 2013
The HalfLife of a Radioisotope
By Jeremiah Stoddard
Abstract:
The half-life of a radioisotope is the time required for half the atoms in a given sample to undergo radioactive, or nuclear, decay. Half-life is given the symbol t1/2.Different radioisotopes have different half-lives. The amount of radioactive isotope remaining can be calculated using the equation,...

...
The Half-Life of a Radioisotope:
10-22-14
Abstract: The half-life of a radioisotope is the time required for half the atoms in a given sample to undergo radioactive, or nuclear decay. The amount of radioactive isotope remaining can be calculated using the equation, t1/2 = .693/K. A sample data set was provided due to safety concerns. Using the data set, a half-life of 14.27days -1
was...

...PHY101 - Lab 12
15/7/26 18:21
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Lab 12
Counting Atoms and
Nuclear Physics
Introduction: Connecting Your Learning
This laboratory activity will model the relationship between the rate of radioactive decay in a
sample and the amount of radioactive material that is capable of undergoing radioactive decay.
Many processes in nature behave this way. For example, the rateof change in the population
depends on the number of people present, and the same is...

...Title
To determine the half-life of beer foam
Purpose
In this experiment, we will make the bear foam as much as possible by pouring fast and using warm beer and try to estimate the half-life of beer foam based on the changing of height while the foam is collapsing.
Theory
A quantity is said to be subject to exponential decay if it decreases at a rate proportional to its value. Symbolically, this process can be expressed by the...

...Lab 7: Geologic Time
9
Answer Sheet
Name(s)
1. As an example of how radioactive decay works, the TA may lead a small demonstration. Each student will receive one penny and stand up. At this point all of the students are parent isotopes. Every student should then flip their penny. Students whose penny lands heads-up should sit down. These students who are now seated are now daughter isotopes. The remaining standing students should again flip their penny, and students whose...

...HalfLife Experiment
My hypothesis would be that after each shaking
about half of the remaining candies would be logo-up
and half of them logo-down. That's why the shaking
represents a "half-life".
half-life || total time (sec) || # of undecayed atoms || # of decayed atoms
0 0 100 0
1 5...

...Lab Report
Atomic Dating Using Isotopes
Answer the following questions about the results of this activity. Record your answers in the boxes.
Send your completed lab report to your instructor. Don’t forget to save your lab report to your computer!
Reference: Isotope Half-Life Chart
Isotope
Product
HalfLife
Carbon-14
Nitrogen-14
5730 years
Potassium - 40
Argon - 40
1,280...

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