slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Investigation 20A PowerPoint Presentation
Download Presentation
Investigation 20A

Loading in 2 Seconds...

play fullscreen
1 / 11

Investigation 20A - PowerPoint PPT Presentation


  • 177 Views
  • Uploaded on

Investigation 20A. Half-Life Experiment: Coin Toss. Investigation 20A:Half-Life Experiment: Coin Toss. What is a half-life? What does it measure? How can we determine the age of fossils?. Investigation 20A:Half-Life Experiment: Coin Toss. Part 1: Simulating half-life: Short version.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Investigation 20A' - danica


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1
Investigation 20A

Half-Life Experiment: Coin Toss

slide2

Investigation 20A:Half-Life Experiment: Coin Toss

What is a half-life? What does it measure?

How can we determine the age of fossils?

slide3

Investigation 20A:Half-Life Experiment: Coin Toss

Part 1: Simulating half-life: Short version

This experiment is quite simple. It only involves flipping coins and graphing the results.

  • Start with 10 pennies. Call this “t = 0” on your graph, and plot a “10” on the y axis.
  • Toss all 10 pennies on the ground or on the table. Remove all pennies that turn up tails. These will be the decayed atoms.
  • Count the remaining pennies and plot the number. This point will be at “t = 1” on the x axis.
slide4

Investigation 20A:Half-Life Experiment: Coin Toss

Part 1: Simulating half-life: Short version

  • Repeat Steps 2 and 3. Plot this at “t = 2” on the x axis.
  • Repeat Steps 2 and 3 until all the pennies have “decayed.”
slide5

Half-life (t1/2): the time it takes for half of the atoms in a sample to decay.

Investigation 20A:Half-Life Experiment: Coin Toss

Half-life

Every radioactive isotope has a different half-life.

Carbon datingis based on the knowledge that t1/2 for carbon-14 is 5,730 years.

slide6

Investigation 20A:Half-Life Experiment: Coin Toss

Half-life

t1/2

t1/2

t1/2

Ratio not to scale

slide7

Investigation 20A:Half-Life Experiment: Coin Toss

Part 2: Simulating half-life: Long version of Part 1

Repeat the experiment from Part 1, except use 100 pennies. Continue running until all the pennies “decay.”

slide8

Investigation 20A:Half-Life Experiment: Coin Toss

Part 3: Simulating half-life: Long version of Part 2

  • Repeat the experiment from Part 1, using only 10 pennies.
  • Now repeat this experiment a total of 10 times. Add the data from each of the 10 experiments, and plot this on a new graph.
slide9

Investigation 20A:Half-Life Experiment: Coin Toss

Part 3: Simulating half-life: Long version of Part 2

slide10

Investigation 20A:Half-Life Experiment: Coin Toss

Part 4: Thinking about what you have learned

  • How smooth is the graph from Part 1? How about Part 2? How about Part 3?
  • What similarities do you notice about the graphs from Parts 2 and Part 3? Why is that?
  • How would you make this experiment even more precise?

Your data should be similar to this.

slide11

Investigation 20A:Half-Life Experiment: Coin Toss

  • Half-life is only dependent on the type of atom present.
  • Half-life has nothing to do with how many atoms there are, how close they are to each other, what time it is, or any other variables. Running 10 experiments with 10 pennies each is exactly the same as running one half-life experiment with 100 pennies.
  • No matter how many radioactive atoms you have, half will decay after the half-life.