 Properties of waves

# Properties of waves

I can describe the different components of waves.

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## General

Students learn about the different properties of waves and further explore the wavelength, frequency, speed. They are given wave speed equations.

NGSS: MS-PS4-1

## Learning objective

Students will be able to describe the different components of waves.

## Introduction

Review the types of waves shown in the pictures with the class to help identify if they are longitudinal or transversal and to identify the medium the wave moves in. Then have students work in pairs to answer the questions given on the interactive whiteboard.

## Instruction

Introduce students to the properties of waves. Tell students that waves have different properties and use light as an example. Ask students to discuss with a partner what the remember about amplitude. Discuss what they came up with as a class and then explain what wavelength is. Give examples of different kinds of waves with varying wavelength and help students understand the difference between langer and smaller wavelengths. Then introduce frequency. Tell students that frequency measures the number of waves that pass through a given amount of time and is measured in hertz (hz). Combine the concepts of frequency and energy together and discuss how waves with higher frequencies have higher energies and waves with lower frequencies have lower energies. But how are these measured? Show students that the wave speed measures how fast a wave is traveling, and show the equations that can be used to calculate the wave speed. Practice calculating the wave speed as a class with the given information. Then ask students to solve for wave speed in groups or pairs. Show students that you can change the wave speed equation to find either wavelength or frequency. Ask partners to determine which equation to use and calculate the wavelength of the note.

## Quiz

Students are asked to answer multiple-choice questions covering the key concepts of the lesson. They are then given a few true/false questions and are asked to calculate wavelength or frequency.

## Closing

Remind students that they are now able to describe the different components of waves and that waves are all around us. Being able to determine wave speed is really important when you're talking about a tsunami! To close have students complete an exit slip answering the two questions on the interactive whiteboard. 