Holstee Reflection Cards are a fun way to spark meaningful connections. When was the last time you had a memorable conversation? The kind where you learn as much about yourself as you do about others.
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 Project reflection 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 Project reflection 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.
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? List Rutherford's major achievements. 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.
Radioactive decay, also known as radioactivity, is the spontaneous emission of radiation from the unstable nucleus of an atom. In your own words, what do we mean by nuclear decay? What do you think is emitted during radioactive decay?
Have students go to the Isotopes Project website to look for more information about radioactive decay. Have students look at the Glossary of Nuclear Science Terms for alpha and beta decay.
Ask students to explain the terms in their own words. What is the chance of getting heads on any flip? What do we mean by random? After students have discussed these questions, tell them: This method of measuring a rate won't work for radioactive decay. We know that radioactive substances disintegrate at a known rate, however.
We call this rate the isotope's half-life.The Sonic Flashlight TM. US Patent no. , and pending Supported by the NIH, NSF, and the Whitaker Foundation. Visualization and Image Analysis Laboratory.
This science fair project demonstrates the principles of reflection through simple experiments involving mirrors and light. Reflections on Project Management I By cdm6zf · June 17, At our final official Praxis meeting, I shared an overview of my experience as project manager with the rest of the team, and I thought I would share some of those same reflections in a short series of blog posts.
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Self-Reflection on Project Work. Top 10 related resources» Topic tags: revision & reflection. share. none. What is it? This document helps students think about what they did in the project and how well the project went. Download as pdf. Resource Search. Use one or more of these to fine-tune your search.
Class Project Reflections and Reflection Essays. Educator: Sohum Sohoni, Assistant Professor, School of Computing, A co-PI on a research project, a faculty member from the English Department, was the one who helped me formalized the reflections in my first class as part of the progressive learning platform, so really it was the research.