WAVES Essential Questions: What is a wave? How do waves travel? What are the types of waves? What are the properties of waves? What are 4 types of wave interactions?

Day 1 The Nature of Waves

What are Waves?

What is a WAVE? A wave is any disturbance that transfers energy through matter. Waves only carry energy, not matter! Once the wave has moved, the disturbance is gone. The energy carried by ocean waves can break rocks.

How do waves travel? A wave must have MATTER to travel through. The matter through which a wave travels is called a MEDIUM

Mechanical Waves Mechanical Waves need a medium to travel through. Examples of Mechanical Waves: sound air 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.

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

Transverse Wave copied

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

Carry energy along the wave Longitudinal Waves Carry energy along the wave

Day 2 Properties of Waves

Properties of Waves: Amplitude Wave Length Frequency Wave Speed

Amplitude wave height larger amplitude = more energy

Wavelength distance between 2 crests or troughs shorter wave length = more energy

Frequency (Hertz / Hz) the number of waves produced in a given amount of time higher frequency = more energy

Wave Speed speed at which waves travel through a medium

Properties of a wave

Day 3 WAVE INTERACTIONS

Reflection Waves reflect after hitting a barrier. all waves can be reflected. a wave can also be transmitted through a substance. Reflection – happens when a wave bounces back after hitting a barrier.

Refraction Refraction – is the bending of a wave as the wave passes from one medium to another at an angle.

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

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

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

WAVES _________ ________ reflection interference types are always properties can undergo WAVES types examples examples x-rays radio waves infrared radiation microwaves visible light sound air 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 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 air water ropes earthquakes tsunami waves Concept Map Key do NOT need a medium need a medium are always can be either Transverse Longitudinal