The Nature of Waves

What is a wave?

Journal Work What do you think of when you hear the word “wave”? Write a brief description of what you think a wave is, then describe a time you might have experienced waves?

6.P.1.1 Waves: Forces and Motion head your notes like this! Name: ________________ Date: ___________ 6.P.1.1 Waves: Forces and Motion EQ: What are waves? A wave is..

What is a WAVE? A wave is any disturbance that transfers energy through matter or space. Once the wave has moved, the disturbance is gone. The energy carried by ocean waves can break rocks.

Waves are created when a source creates a vibration. What is a WAVE? Waves are created when a source creates a vibration.

Waves are moving energy! What is a WAVE? Waves are moving energy! The energy causes materials to vibrate.

Waves only carry energy, not matter! What is a WAVE? Waves only carry energy, not matter!

The matter through which a wave travels is called a MEDIUM. How do waves travel? The matter through which a wave travels is called a MEDIUM.

Types of Waves

How are waves classified?

6.P.1.1 Waves: Forces and Motion Name: ________________ Date: ___________ 6.P.1.1 Waves: Forces and Motion EQ: What are waves? A wave is.. EQ: How are waves classified? continue on same page

Transverse Waves: waves in which the particles vibrate in an up and down motion ex: light waves not sure? http://www.youtube.com/watch?v=UHcse1jJAto&feature=player_detailpage#t=8

The crest is the highest point on a transverse wave. The trough is the lowest point on a transverse wave. The rest position of the wave is called the node or nodal line.

Transverse Wave copied

Transverse Wave copy this transverse wave into your notes! rest position not sure? copy this transverse wave into your notes!

Carry energy along the wave Longitudinal Waves: waves in which the particles vibrate back and forth in compressional pulses ex: sound waves copied Carry energy along the wave http://www.youtube.com/watch?v=aguCWnbRETU&feature=player_embedded

Longitudinal Wave rarefaction not sure? copy this longitudinal wave into your notes!

Demonstration Materials: Slinky With a student on each end of a slinky, spread out so the slinky is stretched. Students can make transverse waves (image b) and longitudinal waves (image a).

Types of Waves Waves can also be classified on if they need a medium or don’t need a medium to travel…

Mechanical Waves Mechanical Waves need a medium to travel through. Examples of Mechanical Waves: sound water ropes earthquakes tsunami waves Mechanical Waves can be either Transverse or Longitudinal

Electromagnetic Waves Electromagnetic Waves do NOT need a medium to travel through. Examples of Electromagnetic Waves: x-rays radio waves infrared radiation microwaves visible light

Electromagnetic Waves Electromagnetic Waves are ALWAYS transverse waves.

Properties of Waves

What properties do waves have?

Journal Work Explain the differences between longitudinal and transverse waves. Remember to write in complete sentences.

take notes inside foldable Properties of Waves Foldabe: Amplitude Wave Length Frequency Wave Speed take notes inside foldable

Wave Length Wave Speed Amplitude Frequency

Amplitude Amplitude = wave height

Amplitude larger amplitude = more energy

Wavelength Wavelength = distance between 2 crests or troughs

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers 1 nanometer = 1 of a meter!!! 1,000,000,000

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers

Wavelength shorter wave length = more energy

Frequency (Hertz / Hz) Frequency = the number of waves that pass by a point each second

What properties do waves have?

Journal Work Explain the differences between longitudinal and transverse waves. Remember to write in complete sentences.

take notes inside foldable Properties of Waves Foldabe: Amplitude Wave Length Frequency Wave Speed take notes inside foldable

Wave Length Wave Speed Amplitude Frequency

Amplitude Amplitude = wave height

Amplitude larger amplitude = more energy

Wavelength Wavelength = distance between 2 crests or troughs

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers 1 nanometer = 1 of a meter!!! 1,000,000,000

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers

Wavelength shorter wave length = more energy

Frequency (Hertz / Hz) Frequency = the number of waves that pass by a point each second

Frequency (Hertz / Hz) higher frequency = more energy

Wave Speed Wave Speed = speed at which waves travel through a medium

Waves and Current http://studyjams.scholastic.com/studyjams/jams/science/weather-and-climate/waves-and- currents.htm

VOCAB WORDS for Quiz AMPLITUDE FREQUENY WAVE SPEED WAVE LENGTH WAVE MEDIUM MECHANICAL WAVE ELECTROMAGNETIC WAVE LONGITUDINAL WAVE TRANSVERSE WAVE AMPLITUDE FREQUENY WAVE SPEED WAVE LENGTH

Wave Interactions Extension

What interactions can waves undergo? extension of unit, I feel necessary to go over

Welcome Work Attempt to fill out the following flow map. Use your notes if necessary

WAVES **Attempt to fill in this chart** _________ ________ reflection We are learning these things today, so you may leave them blank for now! **Attempt to fill in this chart** _________ ________ reflection interference properties can undergo WAVES types examples examples Print this slide and have students fill in the concept map do _____need a __________ need a __________ are always can be either

6.P.1.1 Waves: Forces and Motion head your notes like this! Name: ________________ Date: ___________ 6.P.1.1 Waves: Forces and Motion EQ: What interactions can waves undergo? Reflection..

Reflection Reflection- happens when a wave bounces after hitting a barrier.

Reflection All waves can be reflected.

Refraction Refraction – is the change in direction of a wave when it changes speed as it travels from one material(medium) to another. refraction occurs when a wave changes speed. Light waves change direction when they slow down as they pass from air to water.

Diffraction The bending of waves around a barrier or through an opening is known as diffraction.

Diffraction nosey Sound wavelengths are MUCH longer than light wavelengths (measured in nanometers). This is why you can hear someone talking in another room with an open door, even though you can’t see them.

Interference happens when waves overlap Constructive: amplitude increases Destructive: amplitude decreases

Interference

Resonance Resonance – vibration produced in one object that is caused by the vibration produced in another

WAVES **Finish filling in this chart** _________ ________ reflection interference properties can undergo WAVES types examples examples x-rays radio waves infrared radiation microwaves visible light sound water ropes earthquakes tsunami waves Print this slide and have students fill in the concept map do _____need a __________ need a __________ are always can be either

Electromagnetic Waves **CHECK YOUR ANSWERS** amplitude wave length frequency wave speed refraction reflection diffraction interference properties can undergo WAVES types examples Electromagnetic Waves Mechanical Waves examples x-rays radio waves infrared radiation microwaves visible light sound water ropes earthquakes tsunami waves Concept Map Key do NOT need a medium need a medium are always can be either Transverse Longitudinal

Seismic Waves Extension

What properties do waves have?

Journal Work Explain the differences between longitudinal and transverse waves. Remember to write in complete sentences.

take notes inside foldable Properties of Waves Foldabe: Amplitude Wave Length Frequency Wave Speed take notes inside foldable

Wave Length Wave Speed Amplitude Frequency

Amplitude Amplitude = wave height

Amplitude larger amplitude = more energy

Wavelength Wavelength = distance between 2 crests or troughs

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers 1 nanometer = 1 of a meter!!! 1,000,000,000

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers

Wavelength human eyes can detect electromagnetic waves with a wavelength between 400 and 700 nanometers

Wavelength shorter wave length = more energy

Frequency (Hertz / Hz) Frequency = the number of waves that pass by a point each second

Frequency (Hertz / Hz) higher frequency = more energy

Wave Speed Wave Speed = speed at which waves travel through a medium

VOCAB WORDS for Quiz AMPLITUDE FREQUENY WAVE SPEED WAVE LENGTH WAVE MEDIUM MECHANICAL WAVE ELECTROMAGNETIC WAVE LONGITUDINAL WAVE TRANSVERSE WAVE AMPLITUDE FREQUENY WAVE SPEED WAVE LENGTH

Wave Interactions Extension

What interactions can waves undergo? extension of unit, I feel necessary to go over

Welcome Work Attempt to fill out the following flow map. Use your notes if necessary

WAVES **Attempt to fill in this chart** _________ ________ reflection We are learning these things today, so you may leave them blank for now! **Attempt to fill in this chart** _________ ________ reflection interference properties can undergo WAVES types examples examples Print this slide and have students fill in the concept map do _____need a __________ need a __________ are always can be either

6.P.1.1 Waves: Forces and Motion head your notes like this! Name: ________________ Date: ___________ 6.P.1.1 Waves: Forces and Motion EQ: What interactions can waves undergo? Reflection..

Reflection Reflection- happens when a wave bounces after hitting a barrier.

Reflection All waves can be reflected.

Refraction Refraction – is the change in direction of a wave when it changes speed as it travels from one material(medium) to another. refraction occurs when a wave changes speed. Light waves change direction when they slow down as they pass from air to water.

Diffraction The bending of waves around a barrier or through an opening is known as diffraction.

Diffraction nosey Sound wavelengths are MUCH longer than light wavelengths (measured in nanometers). This is why you can hear someone talking in another room with an open door, even though you can’t see them.

Interference happens when waves overlap Constructive: amplitude increases Destructive: amplitude decreases

Interference

Resonance Resonance – vibration produced in one object that is caused by the vibration produced in another

WAVES **Finish filling in this chart** _________ ________ reflection interference properties can undergo WAVES types examples examples x-rays radio waves infrared radiation microwaves visible light sound water ropes earthquakes tsunami waves Print this slide and have students fill in the concept map do _____need a __________ need a __________ are always can be either

Electromagnetic Waves **CHECK YOUR ANSWERS** amplitude wave length frequency wave speed refraction reflection diffraction interference properties can undergo WAVES types examples Electromagnetic Waves Mechanical Waves examples x-rays radio waves infrared radiation microwaves visible light sound water ropes earthquakes tsunami waves Concept Map Key do NOT need a medium need a medium are always can be either Transverse Longitudinal

Seismic Waves Extension

How are waves in Earthquakes like other waves?

Journal Work How do you think earthquake waves are alike/different from the waves we have learned about so far in this unit? Record your thoughts in your journal.

Seismic waves move through the ground during an earthquake.

Seismic Waves Primary Waves are longitudinal (compressional) waves Secondary Waves are transverse waves Some of these waves are longitudinal (compressional), and others are transverse.

Seismic Waves The seismic waves that cause most damage to buildings are a kind of rolling waves. These rolling waves are surface waves and are a combination of longitudinal and transverse waves.

Seismic Waves: Surface Waves Love Wave Rayleigh Wave

(to tune of Silver Bells) SEISMIC WAVES (to tune of Silver Bells)  Feel a rumble, then a grumble What is happ’ning you say Underground there’s a feeling of earthquake   Building-swaying, terror-making Falling bricks block your way And with each faithful tremor you think … Seismic waves, seismic waves They’re why the building is swaying After shocks, faulted rocks We’ll just rebuild it next year P and S waves, and the L waves From the focus they race Through the earth they can travel a distance P are faster, L are “laster” Liquid S leaves no trace And among on the rubble you fear … They’re why the driveway is cracking Rictcher scale, start to wail We’ll just repave it next year http://www.youtube.com/watch?v=YgHS2E7Qkp8