Warm-up: 01/24 Be ready for class, quiet and in your seat. List today’s date above your warm-up. Write the essential questions and objective for today from the board. Can you answer any of the questions? When you finish…Pick up the Wave Guided notes sheet from the front stool.

WARM-UP: 01/25 Keep your homework on your desk. I will come around and check it. What is the main difference between an electromagnetic and a mechanical wave (use your notes)? Keep your notes out and be ready to finish them today.

Warm-up What is a wave? What do waves transfer? What are the two types of waves?

Warm-up: 01/28 Quietly review your Wave Essential vocabulary. No Talking=Testing Mode Today you will take the “Wave Essential Vocabulary Quiz” Place your completed quiz in the designated box face down. Open your textbook to Unit C. Take out your waves booklet. Continue to work.

Warm-up Open your textbook to the page needed (from your rubric) Take out your waves booklet. Continue to work and raise your hand if you need help, only whispering with your table partner while you work. Do not leave your seat w/o my permission, if you are finished ask me for the next assignment.

Warm-up Describe the differences between reflection, refraction and diffraction. Give an example of each. Take out your wave booklet and continue working (20 minutes of work time). What you do not finish must be completed for homework.

Warm-up Be ready for class, have a pencil, your wave notes and your booklet out. Look over notes-today you will complete the open notes waves assessment, remember the equation for wave speed is multiplication. When finished preview the sound chapter in the textbook (section C) page C35-C65.

Essential questions What is a wave? What is a medium? What is the difference between a longitudinal and transverse wave? What are the properties of a wave? What behaviors do all waves have in common? What is the difference between reflection, refraction, and diffraction?

Nature of Waves Wave—any disturbance (movement) that transfers energy through _______ or empty ________. (Mechanical) Waves move energy by ____________ __________in a medium. Medium—a substance a wave can travel through; it can be__________________. Characteristics of Waves: Sound waves http://www.youtube.com/watch?v=8i6hTU0jw-g matter space vibrating particles solid, liquid, or gas

Nature of Waves Waves that need a medium to move are called _________ ______________Examples: _____________ Seismic waves (earthquakes) Waves that do NOT need a medium are called _________ __________ ___ Examples: _______ ______ Microwaves x-rays T.V. & radio waves electromagnetic waves mechanical waves Sound waves Visible light Ocean waves http://www.youtube.com/watch?v=7yP a8qi5X8 ocean wave animation

Types of waves All waves transfer ________ by repeated _______________. _______________waves—particles vibrate in an ________________motion while the energy moves across. energy vibrations Transverse up-and-down Particles Energy http://www.youtube.com/watch?v=TZIr9mpERbU&NR=1 rope example http://www.youtube.com/watch?v=g49mahYeNgc slow motion

___________ wave—the particles of the medium vibrate back and forth in the same direction the wave energy is moving. ____________ —part of a longitudinal wave where the particles are crowded (pressed) together. RAREFACTION: The part where the particles are spread apart. Longitudinal Compression Particles & Energy

Wave animations http://www.youtube.com/watch?v=7cDAYFTXq3E http://www.youtube.com/watch?v=JsJOug4SqL8

Properties of waves Amplitude—(wave height) distance from the rest position to the crest or trough Large amplitude=more energy crest rest position trough

Wavelength —the distance from any point on a wave to an identical point on the next wave. (crest to crest, trough to trough, compression to compression, rarefaction to rarefaction) Shorter wavelength=more energy

Higher frequency= higher energy Frequency —the number of _________ passing through an area in one _______, measured in _______ (Hz) waves second Hertz 1 Hertz = 1 wave per second 5 waves in 1 second= 5 Hz Higher frequency= higher energy Wave speed— speed at which a wave travels =frequency x wavelength Low frequency-few waves Per second Higher frequency—more Waves per second 1 second

Wave property animations Wave motion: change frequency, wavelength etc…http://profhorn.aos.wisc.edu/wxwise/kinematics/wavemotion.html Characteristics of Waves: Amplitude, Wavelength and Frequency http://www.youtube.com/watch?v=aif5mxf5DtU

Wave Interactions Reflection ___________—when a wave _______ __ _ _ _____after hitting a barrier it can’t go through. bounces back All types of waves can be reflected Example: ______ —a reflected sound wave, sonar echo Light waves reflected off an object allow you to see it. surface

White light bends to form a rainbow _________—the ________ of light waves as they pass through from one medium to another at an angle. Refraction bending When a wave passes from one medium to another, it’s speed and wavelength changes so it _________. Examples: White light bends to form a rainbow bends

_________—the change in direction of a wave as it bends around a barrier or opening Resonance—when two objects vibrate at the same frequency; one object causes _____________________. http://www.acoustics.salford.ac.uk/schools/teacher/lesson3/flash/whiteboardcomplete.swf Diffraction another object to vibrate interactive wave disturbance tutorial

A resonating object absorbs energy from the vibrating object and begins to vibrate too. The 4 month old bridge collapsed during a windstorm with gusts that reached 68 km/h (42 mph). The catastrophe was attributed to faulty design. Instead of allowing the wind to pass through, the suspended girders caught the wind, causing the bridge to buck and roll. The bucking motion earned the bridge the nickname Galloping Gertie. The stronger the wind blew, the more violently the structure oscillated, until it finally broke apart and crashed into the water. http://www.youtube.com/watch?v=CsKKDLKYsVU http://www.wsdot.wa.gov/tnbhistory/connections/connections3.htm

Label the wave parts 1 second 0 seconds Type of wave: Longitudinal Frequency: ____ Hertz 3 wavelength __________ amplitude Type of wave: Transverse Frequency: ____ Hertz __________ 3.5 wavelength ___________

DRAW THIS CHART IN YOUR NOTEBOOK Waves Transverse Longitudinal Energy Medium Frequency Amplitude Wave speed DRAW THIS CHART IN YOUR NOTEBOOK http://sci-culture.com/advancedpoll/GCSE/sine%20wave%20simulator.html wave simulator