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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
slide8
Infrared light
  • Visible light
  • Ultraviolet light
slide9
X-rays
  • Gamma Rays
r o y g b i v
ROYGBIV
  • RED
  • ORANGE
  • YELLOW
  • GREEN
  • BLUE
  • INDIGO
  • VIOLET
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 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.
slide25
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 WavesWhat is the wave equation?
  • V = f 
  • speed = frequency times wavelength
speed of waves speed frequency x wavelength
SPEED OF WAVESspeed = 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.
  • Reflection
  • Refraction
  • Diffraction
  • Interference
explain reflection of a wave
Explain reflection of a wave.
  • Bouncing back of a wave after it strikes a boundary.
explain refraction
Explain Refraction.
  • The change in path of a wave when it moves into a medium of a different density.
slide31

REFRACTIONBending 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.
  • 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.
which of the pictures below is an example of constructive interference
Which of the pictures below is an example of Constructive Interference?

The picture on the left is constructive interference.

The picture on the right is destructive interference.

slide36
4. INTERFERENCE1.   CONSTRUCTIVE INTERFERENCEWhen waves combine and produce a wave that is greater than either of the waves alone.
slide37
2.   DESTRUCTIVE INTERFERENCEWhen waves combine and produce a wave that is less than either wave alone.
applet interference by 3 waves simultaneously
Applet Interference by 3 wavessimultaneously.

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

slide40
NODESStationary 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.
slide42
STANDING WAVESRESONANT FREQUENCY(or natural frequency)The frequency at which a standing wave occurs.
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