Properties of Waves Light and The Eye: Week 1. I Can… G I Can: describe the five properties of...

Properties of WavesProperties of Waves

Light and The Eye: Week 1Light and The Eye: Week 1

I Can…I Can…

I Can: describe the five properties of waves.AmplitudeWavelengthFrequencyEnergySpeed

I Can: describe the five properties of waves.AmplitudeWavelengthFrequencyEnergySpeed

VocabularyVocabularyWaveEnergyMediumMechanical WaveAmplitudeCrestTroughWavelengthFrequency

WaveEnergyMediumMechanical WaveAmplitudeCrestTroughWavelengthFrequency

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

What is a wave?What is a wave?

A wave is a disturbance that transfers energy from place to place.

There are many types of waves…Water wavesStadium “Waves”Light WavesSound WavesSeismic Waves

A wave is a disturbance that transfers energy from place to place.

There are many types of waves…Water wavesStadium “Waves”Light WavesSound WavesSeismic Waves







Waves in LifeWaves in Life





What is Energy?What is Energy?

The ability to do workSo, waves “pass” on energy or the ability to do work.

The ability to do workSo, waves “pass” on energy or the ability to do work.



Have you ever felt

the power of a wave on the beach?



What is a medium?

What is a medium?

Most kinds of waves need something to travel through--we call this a medium.

Gases (such as air), liquids (such as water), and solids (such as rope) can all act as mediums.

Most kinds of waves need something to travel through--we call this a medium.

Gases (such as air), liquids (such as water), and solids (such as rope) can all act as mediums. QuickTime™ and a

TIFF (Uncompressed) decompressorare needed to see this picture.





Sound waves in air

Water waves

Ground Ground destruction destruction after seismic after seismic

waveswaves

Mechanical WavesMechanical Waves

Waves that require a medium to travel through are called mechanical waves.

Tomorrow we will learn about a different type of wave…

Waves that require a medium to travel through are called mechanical waves.

Tomorrow we will learn about a different type of wave…

Properties of a WaveProperties of a Wave

The 5 basic properties of a wave are:AmplitudeWavelengthFrequencyEnergySpeed

The 5 basic properties of a wave are:AmplitudeWavelengthFrequencyEnergySpeed

1. Amplitude1. Amplitude

Crest: the top of a wave.

Trough: the bottom of a wave.

Amplitude: the maximum distance that the medium’s particles move from their starting position.

Crest: the top of a wave.

Trough: the bottom of a wave.

Amplitude: the maximum distance that the medium’s particles move from their starting position.



Crest

Trough

The more energy a wave has the GREATER its amplitude.

2. Wavelength2. Wavelength The distance between two crests or two troughs.

A longer wavelength has more distance in between the two points.

A shorter wavelength has less distance in between the two points.

The distance between two crests or two troughs.

A longer wavelength has more distance in between the two points.

A shorter wavelength has less distance in between the two points.

3. Frequency3. Frequency

The number of complete waves that pass a given point in a time.

A higher frequencyhigher frequency means that there are more waves in a given time.

A lower frequency means that there are fewer waves in a given time.

The number of complete waves that pass a given point in a time.

A higher frequencyhigher frequency means that there are more waves in a given time.

A lower frequency means that there are fewer waves in a given time.

In the amount of time shown

below, how many complete waves do you see for the top? The bottom? Which has a higher frequency?

1 2 3 4 5 6

1 2 3

60 Seconds

4. Energy4. Energy

When waves travel through a medium--they do NOT carry the medium along with them.

When a wave hits a medium it transfers its ENERGY to the medium’s particles.

When waves travel through a medium--they do NOT carry the medium along with them.

When a wave hits a medium it transfers its ENERGY to the medium’s particles.



The rope just moves up and

down--the energy is moved along.

Direction of wave = direction of energy

5. Speed5. Speed

Different waves travel at different speeds.

Speed: how far a wave travels in a given amount of time.

Just like the rate we calculate in math….RATE=Distance

Time

Different waves travel at different speeds.

Speed: how far a wave travels in a given amount of time.

Just like the rate we calculate in math….RATE=Distance

Time



The Relationships between PropertiesThe Relationships between Properties

Creating Waves ActivityCreating Waves Activity

Creating WavesCreating WavesDirections: In your lab groups, work to create the type of waves described on the handout.TRY NOT to spill the water out of the tub

There is no right or wrong answer--experiment for yourselves!

Record your answers in complete sentences.

Raise your hand to call for my help.

Directions: In your lab groups, work to create the type of waves described on the handout.TRY NOT to spill the water out of the tub

There is no right or wrong answer--experiment for yourselves!

Record your answers in complete sentences.

Raise your hand to call for my help.

Frequency & WavelengthFrequency & Wavelength

The higher the frequency, the shorter the wavelength.

The lower the frequency, the longer the wavelength.

The higher the frequency, the shorter the wavelength.

The lower the frequency, the longer the wavelength.

Energy and FrequencyEnergy and Frequency

High frequency waves have more power.

Low frequency waves have less power.

High frequency waves have more power.

Low frequency waves have less power.

The frequency and energy of a wave are POSITIVELY CORRELATED. Low frequency (slow) = Low energy (weak)

High frequency (fast) = High energy (strong)

The frequency and energy of a wave are POSITIVELY CORRELATED. Low frequency (slow) = Low energy (weak)

High frequency (fast) = High energy (strong)

The wavelength and frequency of a wave are NEGATIVELY CORRELATED. Long wavelength =

Low frequency (slow)

Short wavelength = High frequency (fast)

The wavelength and frequency of a wave are NEGATIVELY CORRELATED. Long wavelength =

Low frequency (slow)

Short wavelength = High frequency (fast)



Shorter Wavelength

Longer Wavelength

Higher Frequency

Lower Frequency

Lower Energy

Higher Energy

Let’s sum it all up….Let’s sum it all up….

Short Wavelength = High Frequency = High Energy

Long Wavelength = Low Frequency = Low Energy



Therefore…Therefore…

If you have information about one of the three (frequency, wavelength, energy), you can also figure out the other two. Let’s practice!

If a wave has a high frequency, it has a _________ wavelength and _________ energy.

If a wave has a low frequency, it has a _________ wavelength and _________ energy.

If you have information about one of the three (frequency, wavelength, energy), you can also figure out the other two. Let’s practice!

If a wave has a high frequency, it has a _________ wavelength and _________ energy.

If a wave has a low frequency, it has a _________ wavelength and _________ energy.

Exit QuizExit Quiz

1. Draw a diagram of a wave and label the crest, trough, amplitude, and wavelength.

2. What is the difference between the frequency and the speed of a wave.

3. Given a low frequency we can predict a ________wavelength and ____energy.

1. Draw a diagram of a wave and label the crest, trough, amplitude, and wavelength.

2. What is the difference between the frequency and the speed of a wave.

3. Given a low frequency we can predict a ________wavelength and ____energy.

Properties of Waves Light and The Eye: Week 1. I Can… G I Can: describe the five properties of...

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