Waves: An introductionWaves: An introduction

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Entry Task: In your journal, Entry Task: In your journal, complete this entry task!complete this entry task!

Draw the concept Draw the concept map and fill in the map and fill in the blanks.blanks.

Notes: Create a table like thisNotes: Create a table like this

Type of Type of wavewave

MechanicalMechanical MechanicalMechanical ElectromagneticElectromagnetic

FormForm LongitudinalLongitudinal TransverseTransverse Modeled as Modeled as TransverseTransverse

MediumMedium (required / not (required / not required)required)

(required / not (required / not required)required)

(required / not (required / not required)required)

DescriptionDescription (disturbance (disturbance parallel / parallel / perpendicular to perpendicular to energy energy propagation)propagation)

(disturbance (disturbance parallel / parallel / perpendicular to perpendicular to energy energy propagation)propagation)

(disturbance parallel / (disturbance parallel / perpendicular to energy perpendicular to energy propagation)propagation)

ExamplesExamples

All waves have:All waves have:

Part of the Part of the wavewave

Abbreviation Abbreviation or equationor equation

Plain English Plain English DefinitionDefinition

AmplitudeAmplitude

wavelengthwavelength

frequencyfrequency

velocityvelocity

What Is a Wave?What Is a Wave?

Waves carry energy through matter or space. Waves carry energy through matter or space.

A mechanical A mechanical wavewave is a is a periodicperiodic disturbance in a solid, disturbance in a solid, liquid, or gas as energy is transmitted through a medium.liquid, or gas as energy is transmitted through a medium.

• The The matter through which a wave travels is called the matter through which a wave travels is called the medium.medium.

Waves that require a Waves that require a mediummedium are called are called mechanical mechanical waves.waves.

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Transverse WavesTransverse Waves AA transverse wavetransverse wave isis a wave in which the a wave in which the

particles of the medium move particles of the medium move perpendicular to the direction the wave is perpendicular to the direction the wave is traveling.traveling.

Examples include: Examples include: water waves, rope water waves, rope waves, some earthquake waveswaves, some earthquake waves• Light waves are modeled as transverse Light waves are modeled as transverse

waves.waves.• D:\Ch14\70355.htmlD:\Ch14\70355.html

Light and Electromagnetic WavesLight and Electromagnetic Waves

Light does not require a medium.Light does not require a medium.

Light wavesLight waves are called are called electromagnetic waveselectromagnetic waves..

An An electromagnetic waveelectromagnetic wave consists of consists of oscillating electric and magnetic fieldsoscillating electric and magnetic fields, which , which radiate outward at the speed of light.radiate outward at the speed of light.

Examples include: visible light, radio waves, x-Examples include: visible light, radio waves, x-raysrays

Longitudinal WavesLongitudinal Waves

A A longitudinal wavelongitudinal wave is a wave in which the is a wave in which the particles of the medium vibrate parallel to the particles of the medium vibrate parallel to the direction of wave motion.direction of wave motion.

• Sound waves are longitudinal wavesSound waves are longitudinal waves.. • D:\Ch14\70356.htmlD:\Ch14\70356.html

(some Earthquake waves are also longitudinal)(some Earthquake waves are also longitudinal)

Surface WavesSurface Waves

In a surface wave, particles move in In a surface wave, particles move in circles.circles.• Surface wavesSurface waves occur at the occur at the boundary boundary

between two different mediumsbetween two different mediums, such as , such as between water and air.between water and air.

• The The particles moveparticles move both both perpendicularly and perpendicularly and parallel to the direction that the wave travels.parallel to the direction that the wave travels.

• D:\Ch14\80411.htmlD:\Ch14\80411.html

Vibrations and WavesVibrations and Waves

Waves are related to vibrations.Waves are related to vibrations.

Most waves are caused by a vibrating object.Most waves are caused by a vibrating object. • Electromagnetic waves may be caused by vibrating Electromagnetic waves may be caused by vibrating

charged particles. charged particles.

• In a mechanical wave, the particles in the medium In a mechanical wave, the particles in the medium also vibrate as the wave passes through the medium.also vibrate as the wave passes through the medium.

Vibrations involve transformations of energy.Vibrations involve transformations of energy.

InterferenceInterference

Wave InteractionsWave Interactions

TypeType Plain English Plain English DefinitionDefinition

ExampleExample

RefractionRefraction

ReflectionReflection

DiffractionDiffraction

Constructive Constructive InterferenceInterference

Destructive Destructive InterferenceInterference

Assignment: Complete in your Assignment: Complete in your journaljournal

Check over and finish video worksheet. See Check over and finish video worksheet. See chapters 14-15(pp452-518) to complete chapters 14-15(pp452-518) to complete any answers you might have missed.any answers you might have missed.