15.1 Radioactivity


An overview of radioactivity, its history, its nature, and how it is detected. Duration: 6:53.

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Chapter Introduction

John discusses the importance of learning about the atomic nucleus from the top of an extinct volcano rising some 20,000 feet above the ocean floor. Duration: 2:19.

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The Discovery of Radioactivity

A talking head discussion of the discovery of radioactivity and the people who discovered. it. Duration: 4:30.

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Three Different Types of Radiation

The properties of three different types of radiation are discussed. Duration: 4:18.

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Penetrating Powers of Radiation

Radioactive samples are held up to a Geiger counter to demonstrate the differing penetrating powers of different types of radiation. Duration: 2:45.

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