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WAVES. Chapter 12 Physics. Waves transfer what?. ENERGY!!!!. What are the two main types of waves?. MECHANICAL WAVES ELECTROMAGNETIC WAVES. Which type of wave requires a medium?. MECHANICAL WAVES Electromagnetic waves do NOT need a medium. What are 3 examples of Mechanical Waves?.

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Waves

WAVES

Chapter 12

Physics



What are the two main types of waves
What are the two main types of waves?

  • MECHANICAL WAVES

  • ELECTROMAGNETIC WAVES


Which type of wave requires a medium

Which type of wave requires a medium?

MECHANICAL WAVES

Electromagnetic waves do NOT

need a medium.


What are 3 examples of mechanical waves
What are 3 examples of Mechanical Waves?

  • Water waves

  • Sound waves

  • Seismic waves


What are some examples of electromagnetic waves

Radio waves

What are some examples ofElectromagnetic Waves?





What are the colors of visible light
What are the colors of Visible Light?

  • ROYGBIV


R o y g b i v
ROYGBIV

  • RED

  • ORANGE

  • YELLOW

  • GREEN

  • BLUE

  • INDIGO

  • VIOLET


Which color is the highest energy wave
Which color is the HIGHEST energy wave?

  • VIOLET


Which color is the lowest energy wave
Which color is theLOWEST energy wave?

  • RED


What 3 characteristics do all waves have
What 3 characteristics doAll Waves have?

  • Amplitude

  • Wavelength

  • Frequency


What does the size of the amplitude of a wave tell us
What does the size of the amplitude of a wave tell us?

  • HIGH AMPLITUDE = HIGH AMOUNTS OF ENERGY

  • LOW AMPLITUDE = LOW AMOUNTS OF ENERGY



What greek letter do we use to represent a wavelength
What greek letter do we useto represent a wavelength?

  • Lambda 


What are the 3 units we can use for frequency of a wave
What are the 3 units we can use for Frequency of a wave?

  • Waves / second

  • Cycles / second

  • 1/s = Hertz (Hz)


Frequency example problem
Frequency Example Problem

  • A boy standing on a dock counts 20 waves

  • pass by in 5 seconds. What is the frequency

  • of the waves?

f = #waves / time

20 waves / 5 seconds = 4 Hz


Frequency example problem 2
Frequency Example Problem #2

  • If the frequency of the waves is increased

  • to 8 Hz, how many waves will pass by the

  • boy in 2 seconds?

f = #waves / time

8 Hz = #waves / 2 seconds

8 Hz x 2 seconds = 16 waves


Name the 2 types of mechanical waves
Name the 2 types of Mechanical waves.

  • TRANSVERSE WAVES

  • LONGITUDINAL WAVES



Longitudinal wave do not have crests and troughs instead they have what
Longitudinal wave do not have crests and troughs, instead they have what?

  • COMPRESSIONS

  • RAREFACTIONS


How does the medium move when a longitudinal wave moves through it
How does the medium movewhen a longitudinal wave moves through it?

  • The medium vibrates horizontally.


Surface Waves move both horizontally and vertically simultaneously, which produces what kind of movement?

  • Circular


Speed of waves what is the wave equation
Speed of Waves simultaneously, which produces what kind of movement?What is the wave equation?

  • V = f 

  • speed = frequency times wavelength


Speed of waves speed frequency x wavelength
SPEED OF WAVES simultaneously, which produces what kind of movement?speed = frequency x wavelength

v = f x λ

Example #1

A wave on a lake is traveling with a velocity of 8 m/s.

the frequency is 2 Hz. What is the wavelength of

this wave?

8 m/s = 2 Hz xλ

λ = 4 m

Speed of a wave example

http://www.acoustics.salford.ac.uk/schools/teacher/lesson1/lesson1interactive.html


Name the 4 ways waves interact
Name the 4 ways waves interact. simultaneously, which produces what kind of movement?

  • Reflection

  • Refraction

  • Diffraction

  • Interference


Explain reflection of a wave
Explain reflection of a wave. simultaneously, which produces what kind of movement?

  • Bouncing back of a wave after it strikes a boundary.


Explain refraction
Explain Refraction. simultaneously, which produces what kind of movement?

  • The change in path of a wave when it moves into a medium of a different density.


REFRACTION simultaneously, which produces what kind of movement?Bending of waves due to a change in speed.Short tutorial/animation to watch.http://www.wiley.com/college/strahler/0471480533/animations/ch19_animations/animation2.html


Explain diffraction
Explain Diffraction. simultaneously, which produces what kind of movement?

  • The curving of waves around barriers and ability of waves to spread out in circular pattern after passing through a narrow opening. See picture below.


3 diffraction bending of waves around the edge of an obstacle
3. DIFFRACTION simultaneously, which produces what kind of movement?Bending of waves around the edge of an obstacle.


What are the 2 types of interference
What are the 2 types of Interference? simultaneously, which produces what kind of movement?

  • Constructive

  • Destructive


Which of the pictures below is an example of constructive interference
Which of the pictures below is an example of simultaneously, which produces what kind of movement?Constructive Interference?

The picture on the left is constructive interference.

The picture on the right is destructive interference.


4. INTERFERENCE simultaneously, which produces what kind of movement?1.   CONSTRUCTIVE INTERFERENCEWhen waves combine and produce a wave that is greater than either of the waves alone.


2.   DESTRUCTIVE INTERFERENCE simultaneously, which produces what kind of movement?When waves combine and produce a wave that is less than either wave alone.


Applet interference by 3 waves simultaneously
Applet Interference by 3 waves simultaneously, which produces what kind of movement?simultaneously.

Constructive interference applet

http://id.mind.net/~zona/mstm/physics/waves/interference/waveInterference1/WaveInterference1.html

Both Constructive/Destructive interference applet

http://id.mind.net/~zona/mstm/physics/waves/interference/waveInterference2/WaveInterference2.html


Nodes and antinodes are parts of what kind of wave
Nodes and Antinodes are parts of what kind of wave? simultaneously, which produces what kind of movement?

  • Standing Wave


NODES simultaneously, which produces what kind of movement?Stationary points of a standing wave.ANTINODESLoops of a standing wave where maximum oscillation of the medium occurs.


The frequency at which a standing wave occurs is called what
The frequency at which a standing wave occurs is called what?

  • Resonant Frequency

  • Sometimes called Natural Frequency.


STANDING WAVES what?RESONANT FREQUENCY(or natural frequency)The frequency at which a standing wave occurs.


The End!. what?


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