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  • Radioactive Decay
Alpha Decay
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CC BY
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Watch alpha particles escape from a polonium nucleus, causing radioactive alpha decay. See how random decay times relate to the half life.

Subject:
Physical Science
Material Type:
Simulation
Provider:
University of Colorado Boulder
Provider Set:
PhET Interactive Simulations
Author:
Carl Wieman
Danielle Harlow
John Blanco
Kathy Perkins
Noah Podolefsky
Ron LeMaster
Sam McKagan
Wendy Adams
Date Added:
07/21/2011
Biology
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CC BY
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Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

Subject:
Life Science
Biology
Material Type:
Full Course
Provider:
Rice University
Provider Set:
OpenStax College
Date Added:
08/22/2012
Biology, The Chemistry of Life, The Chemical Foundation of Life, Atoms, Isotopes, Ions, and Molecules: The Building Blocks
Conditional Remix & Share Permitted
CC BY-NC
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By the end of this section, you will be able to:Define matter and elementsDescribe the interrelationship between protons, neutrons, and electronsCompare the ways in which electrons can be donated or shared between atomsExplain the ways in which naturally occurring elements combine to create molecules, cells, tissues, organ systems, and organisms

Subject:
Applied Science
Life Science
Biology
Material Type:
Module
Provider:
Rice University
Provider Set:
OpenStax College
Date Added:
07/10/2017
Remix
Biology, The Chemistry of Life, The Chemical Foundation of Life, Atoms, Isotopes, Ions, and Molecules: The Building Blocks
Conditional Remix & Share Permitted
CC BY-NC-SA
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By the end of this section, you will be able to:Define matter and elementsDescribe the interrelationship between protons, neutrons, and electronsCompare the ways in which electrons can be donated or shared between atomsExplain the ways in which naturally occurring elements combine to create molecules, cells, tissues, organ systems, and organisms

Subject:
Applied Science
Life Science
Biology
Material Type:
Module
Provider:
Rice University
Provider Set:
OpenStax College
Author:
Tina B. Jones
Date Added:
08/26/2019
Exponential decay and semi-log plots
Conditional Remix & Share Permitted
CC BY-NC-SA
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Using exponential decay equation to solve for relationship between k and half-life. Using semi-log plot to get graph of a straight line with slope of -k. Created by Jay.

Subject:
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Association of American Medical Colleges
Author:
James Luer
Date Added:
06/12/2014
Exponential decay formula proof (can skip, involves calculus)
Conditional Remix & Share Permitted
CC BY-NC-SA
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Showing that N(t)=Ne^(-kt) describes the amount of a radioactive substance we have at time T. For students with background in Calculus. Not necessary for intro chemistry class. Created by Sal Khan.

Subject:
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
09/11/2009
Exponential decay problem solving
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CC BY-NC-SA
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Introduction to Exponential Decay. Using the exponential decay formula to calculate k, calculating the mass of carbon-14 remaining after a given time, and calculating the time it takes to have a specific mass remaining . Created by Sal Khan.

Subject:
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
09/11/2009
Half-life and carbon dating
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CC BY-NC-SA
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Carbon dating is a real-life example of a first-order reaction. This video explains half-life in the context of radioactive decay. Created by Sal Khan.

Subject:
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
09/11/2009
Half-life plot
Conditional Remix & Share Permitted
CC BY-NC-SA
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Definition of half-life and graphing the decay of phosphorus-32. Calculating how much phosphorus-32 remains after 57.2 days. Created by Jay.

Subject:
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Association of American Medical Colleges
Author:
James Luer
Date Added:
06/12/2014
More exponential decay examples
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CC BY-NC-SA
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A few more examples of exponential decay. Practice calculating k from half-life, and calculating initial mass. Created by Sal Khan.

Subject:
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
09/11/2009