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Downside to Vocaroo - it expires! We know that radioactive substances disintegrate at a known rate, however. List Rutherford's major achievements.

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Radioactive decay, also known as radioactivity, is the spontaneous emission of radiation from the unstable nucleus of an atom. After students have completed the activity, discuss the answers to the analysis questions with the whole class.

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What do we mean by random? Write about how the strontium might accumulate in your body teeth and bones and how it might affect you.

Much easier than using Audacity for quick recordings! At the end of the lab, give them the opportunity to revisit these questions and change or justify their answers. We call this rate the isotope's half-life. Ask students to explain the terms in their own words.

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You also don't have to check out a book today if you're not ready to start a new book relationship! You may group them in any size, but working in pairs is optimal for this exercise. Take a book cart and shop for some hot books around your library media center.

If they haven't changed their answers, ask them to explain why. What important discovery was made by Wilhelm Roentgen?

Have students write their answers to these questions in their science journals. How many nuclei will be left after the second half-life? Have students look at the Glossary of Nuclear Science Terms for alpha and beta decay.

It is the length of time required for the disintegration of one-half of a given number of nuclei of a radioactive element. Where in your environment might scientists look for large concentrations of strontium?

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Strontium is chemically similar to calcium. Let's begin with a small number.

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What two elements were discovered by Marie and Pierre Curie? In your own words, what do we mean by nuclear decay? What did Becquerel discover through his experiments? Love Time Bomb Have you discovered the classroom timer collection? The mathematics of inferring backwards from measurements to age is not appropriate for most students.

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This lesson can be done in two, minute class periods. 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. Also, return to the questions you asked in the introduction to the lesson and allow students to revise their answers. 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. Context This is the second lesson in a three-lesson series about isotopes, radioactive decay, black dating in san francisco and the nucleus.

So, I guess you only have it for a year. What material did Antoine Becquerel work with in his own investigations of X rays? Students should complete the Analysis section of the lab sheet, which will be used as part of their assessment.

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