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# 19.1: Chapter 19: Waves

Difficulty Level: At Grade Created by: CK-12

## Chapter Overview

Mechanical waves are waves that transfer energy through matter. Types of mechanical waves include transverse, longitudinal, and surface waves. Several parameters can be used to measure waves, including wave amplitude, wavelength, wave frequency, and wave speed. Waves with greater amplitude, shorter wavelength, or higher frequency have greater energy. Types of wave interactions include reflection, refraction, and diffraction. Waves may interact with constructive or destructive interference.

## Online Resources

See the following Web sites for appropriate laboratory activities:

The labs at this URL are designed to introduce students to various types of waves and the language used to describe them. They will explore transverse, longitudinal, electromagnetic, and water waves through simple and practical experiments.

If you have access to a ripple tank, you can choose from the collection of wave labs at the following URL. Several of the labs focus on wave reflection.

These Web sites may also be helpful:

A large number of middle school resources pertaining to waves are available at this URL. The resources include online quizzes, slideshows, activities, labs, and games.

You can find several PowerPoint presentations on waves at the following URL: http://www.freeclubweb.com/powerpoints/science/sound.html.

The tutorial at the URL below incorporates excellent animations and simulations of wave properties and wave interference. You may find it useful for content support.

This tutorial provides deeper content for teachers on the energy and amplitude of waves: http://www.physicsclassroom.com/Class/waves/U10L2c.cfm.

Another refresher on waves for teachers is available at the URL below. It is a four-lesson animated tutorial that covers all chapter topics.

## Pacing the Lessons

Lesson Class Period(s) (60 min)
19.1 Characteristics of Waves 2.0
19.2 Measuring Waves 2.0
19.3 Wave Interactions and Interference 2.0

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