Waves

Waves & Their Behavior

Essential Standard

• 6.P.1Understand the properties of waves and the wavelike property of energy in earthquakes, light and sound waves.

Clarifying Objective

• 6.P .1.1 Compare the properties of waves to the wavelike property of energy in earthquakes, light and sound.

Essential Questions• What are the 5 PROPERTIES of waves?

• What are waves?

• What are the characteristics of Transversal Waves?

• What are the characteristics of Longitudinal Waves?

• What is a COMPRESSION in a wave?

• What is a RAREFACTION in a wave?

Waves• Waves are a disturbance or

vibration a way of transferring ENERGY from one place to another

• They transport ENERGY from on place to another

• There are different categories & types of waves

• They all have their own characteristics that make them waves

Essential Questions

• Get with a partner and answer…

• What are waves?

Crest & Trough of Waves

• The CREST of the wave is the top of the wave

• The TROUGH of the wave is the bottom of the wave

• Energy moves through crests and troughs from one place to another

Categories of Waves

• There are two categories of waves. All waves transfer energy through

① Transversal movement② Longitudinal

movement

Transversal Waves• Transversal Waves are waves

that make a perpendicular motion in the direction of the wave

• An example would be an ocean wave moving towards the beach

• http://www.youtube.com/watch?v=yd-G6KYwzvA

• 0:56-2:47

Longitudinal Waves• Longitudinal Waves are like

pinball waves. These waves vibrate in the direction of the flow of energy

• An example is a pinball machine

• http://www.youtube.com/watch?v=yd-G6KYwzvA

• 2:48-3:47

Essential Questions

• Get with a partner and answer…

• What are the characteristics of Transversal Waves?

• What are the characteristics of Longitudinal Waves?

Types of Waves

• There are 3 main types of waves. All waves fall into one of these types

① Mechanical ② Electromagnetic③ Matter

Mechanical Waves

• Mechanical Waves are waves that require a solid, liquid or gas to move through

① Transversal Waves

② Longitudal Waves

Electromagnetic Waves• Electromagnetic Waves are waves

that wave through electromagnetic fields

• These are the only waves that do not require a medium to travel through

• Transversal Waves

• http://www.youtube.com/watch?v=d50avTf0OLw

• 4:00-4:34

Properties of Waves• There are 5 different

properties of a wave

• Waves must have these things (properties) to be waves

① Wavelength② Amplitude③ Frequency④ Speed⑤ Period

Wavelength• The Wavelength is the

distance between crests of a wave

• Distance between top of the wave to top of the next wave

• http://www.youtube.com/watch?v=00OiptDj40w

• 0:45-1:26

Wave Amplitude• The Amplitude of a wave is

the distance from the (middle of the wave to the top) or (the middle of the wave to the bottom

• From middle to crest or from middle to trough

• http://www.youtube.com/watch?v=00OiptDj40w

• 1:29-2:38

Wave Frequency• The Frequency of a wave is

how many waves are in a given space

• The more waves in the given space the higher the frequency

• http://brianleewhite.com/2012/01/14/understanding-sound-waves-frequency-and-amplitude-video/

• 0:55-1:19

Wave Speed• The Speed/Velocity of a wave is

how far one wave travels in a given amount of time

• An example would be if you took a stop watch and set it to 10 seconds and then measured with a ruler how far one wave moved. That would be the speed of the wave

• How fast is the water carrying the individual wave in a given space

Wave Period• Wave Period is the time it takes to

move from one crest to the next crest

• For example if you take a stopwatch and time the time it takes for your boat to move from the top of one wave to the top of the next wave you have your wave period

• http://www.youtube.com/watch?v=mb2NGRjGIy0

• 0:40-1:00

Essential Questions

• Get with a partner and answer…

• What are the 5 PROPERTIES of waves?

Wave Particles• All waves are moving particles

of matter/atoms

• The particles of matter/atoms are either spread far apart or in close together depending what part of the wave the matter is in

① Compression② Rarefaction

Compression

• Compression is when the particles are pressed very close together

• If you look at the picture to the right compression is marked by (Y)

Rarefaction

• Rarefaction occurs when the particles are far apart from each other

• If you look at the picture to the right Rarefaction is marked by (X)

Essential Questions

• Get with a partner and answer…

• What is a COMPRESSION in a wave?

• What is a RAREFACTION in a wave?

Waves Video

• http://www.youtube.com/watch?v=_pcsOG-H3Ac

• 11:00-12:02

Important Points• Crest is the top of a wave

• Trough is the bottom of a wave

• Transversal waves are up & down hills

• Longitudinal waves are like a coiled spring

• Mechanical Waves must pass through a medium (solid, liquid or gas)

• Electromagnetic Waves do not have to pass through a medium (pass through a vacuum)

• Compression is when particles in a wave are CLOSE together

• Rarefaction is when particles are FAR APART

• There are 5 properties of waves① Wavelength② Amplitude③ Frequency④ Speed ⑤ Period