Unit 3 Lecture 8 Radiation

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Presentation transcript:

Unit 3 Lecture 8 Radiation Image credit: Wikimedia Commons; https://commons.wikimedia.org/wiki/File:ConvectionCells.svg (CC BY-SA 3.0)

https://www.youtube.com/watch?v=zI2vRwFKnHQ What is radiation? The teacher can use this slide to assist students in completing the information in the chart on slide 7.

Radiation: Radiation: energy that travels in the form of waves (electromagnetic radiation) or high-speed particles (particulate radiation). The teacher can use this slide to assist students in completing the information in the chart on slide 7.

Radioactive Decay Particulate Radiation: involves fast-moving, small particles that have energy and mass. The teacher can use this slide to assist students in completing the information in the chart on slide 7.

Radioactive Decay Radioactive decay is the spontaneous breakdown of an unstable nucleus resulting in the release of energy and matter from the nucleus. The teacher can use this slide to assist students in completing the information in the chart on slide 7.

Electromagnetic (EM) radiation a stream of photons (bundles of energy), traveling in waves. This can travel through empty space (no molecules needed). The teacher can use this slide to assist students in completing the information in the chart on slide 7.

The electromagnetic spectrum The teacher can use this slide to assist students in completing the information in the chart on slide 7. The electromagnetic spectrum shows the various types of EM Radiation Within the EM spectrum, there are two types of radiation -- ionizing and non-ionizing.

Ionizing Radiation High energy so it can break chemical bonds -- meaning it can charge (or ionize) an atom that interacts with it. The teacher can use this slide to assist students in completing the information in the chart on slide 7.

Non- Ionizing Radiation Low-energy radiation that doesn't have enough energy to ionize atoms or molecules. The teacher can use this slide to assist students in completing the information in the chart on slide 7.

Heat (IR) Radiation Transfer of heat by electromagnetic waves The Sun is a huge thermal reactor. Energy is carried from the sun to earth. This does not involve contact with matter. The teacher can use this slide to assist students in completing the information in the chart on slide 7.

Heat (IR) Radiation The other forms of heat transfer cannot produce any of the energy that arrives to Earth through the vacuum of space. The teacher can use this slide to assist students in completing the information in the chart on slide 7.