WAVES WAVES & THEIR BEHAVIOR

Essential Standard 6.P.1 Understand 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 Transversal movement 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

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

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 Mechanical waves Electromagnetic waves Matter waves. Mechanical Waves act as the propagation of a disturbance through a material medium due to the repeated periodic motion of the particles of the medium about their mean positions, the disturbance being handed over from one particle to the next. Electromagnetic Waves are the disturbance, which does not require any material medium for its propagation and can travel even through vacuum. They are caused due to varying electric and magnetic fields. Matter Waves are the waves produced in electrons and particles.

Mechanical Waves Mechanical Waves are waves that require a solid, liquid or gas to move through Transversal Waves Longitudal Waves SOUND & SHOCK ARE 2 EXAMPLES OF MECHANICAL WAVES https://www.youtube.com/watch?v=gWGLAAYdbbc

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

Properties of Waves There are 5 different properties of a wave Waves must have these things (properties) to be waves Wavelength Amplitude Frequency Speed 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

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

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/

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

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 Compression 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) Mechanical longitudinal waves are also called compressional waves or compression waves, because they produce compression and rarefaction when traveling through a medium. The other main type of wave is the transverse wave, in which the displacements of the medium are at right angles to the direction of propagation. https://www.youtube.com/watch?v=7cDAYFTXq3E

Rarefaction occurs when the particles are far apart from each other If you look at the picture to the LEFT Rarefaction is marked by (X) Rarefaction https://www.youtube.com/watch?v=PG_zBBTO-Qg

Essential Questions Get with a partner and answer… What is a COMPRESSION in a wave? What is a RAREFACTION in a wave?

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 waves Wavelength Amplitude Frequency Speed Period