For each pair of students, you will need: Context This is the second lesson in a three-lesson series about isotopes, radioactive decay, and the nucleus. The first lesson, Isotopes of Penniesintroduces the idea of isotopes.

For each pair of students, you will need: Context This is the second lesson in a three-lesson series about isotopes, radioactive decay, and the nucleus.

The first lesson, Isotopes of Penniesintroduces the idea of isotopes. An Analogy to Carbon Datingis based on gathering evidence in the present and extrapolating it to the past. To do this lesson and understand half-life and rates of radioactive decay, students should understand ratios and the multiplication of fractions, and be somewhat comfortable with probability.

Games with manipulative or computer simulations should help them in getting the idea of how a constant proportional rate of decay is consistent with declining measures that only gradually approach zero. The mathematics of inferring backwards from measurements to age is not appropriate for most students.

They need only know that such calculations are possible. Benchmarks for Science Literacy, p. The exercise they will go through of predicting and successively counting the number of remaining "mark-side up" candies should help them understand that rates of decay of unstable nuclei 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.

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Kirchhoff's circuit laws - Wikipedia |
Speed is the distance traveled divided by the time of travel. For example; if you were to travel a distance of 10 miles in 2 hours time, then your average speed equals 5 miles per hour. |

The fascinating physics of everyday life Physics doesn't just happen in a fancy lab -- it happens when you push a piece of buttered toast off the table or drop a couple of raisins in a fizzy drink or watch a coffee spill dry. Become a more interesting dinner guest as physicist Helen Czerski presents various concepts in physics you can become familiar with using everyday things found in |

This lesson can be done in two, minute class periods. An Analogy to Carbon Dating, which can be done while students are flipping their candies. In your planning, be sure to include time at the end of the lesson for students to post their data and share the class data.

Planning Ahead Before the lesson, you will have to weigh out about 80 candies for each group of students. If you count ten and weigh them, then multiply by 8, you will know how many grams of candy to weigh out for each group.

Motivation To help students understand the history of radioactivity, have them go to Radioactivity: As students read about these scientists, ask them to think about the following questions: What important discovery was made by Wilhelm Roentgen? What material did Antoine Becquerel work with in his own investigations of X rays?

What did Becquerel discover through his experiments? What two elements were discovered by Marie and Pierre Curie?

Why is Ernest Rutherford considered the father of nuclear physics? Students can supplement this site with a visit to Isotopes Project. Once to that page, students should then go to the Isotope Discovery History, a graph of the number of known isotopes versus the date, and to the Chart of Aristotle and Plato found at the bottom of the pagewhich the site planners cleverly call "the first chart" of isotopes.Websites for high school science experiments, including agriculture, astronomy, biology, chemistry, commercial, environmental studies, and sustainability.

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