Wave Basics
What is a Wave
What is a Wave
All
a wave is, is ENERGY !
What is a Wave
All
No
a wave is, is ENERGY !
matter what type of wave we are
talking about, it is just ENERGY
What does a wave travel on?
What does a wave travel on?
A
wave travels on a MEDIUM
What does a wave travel on?
A
wave travels on a MEDIUM
The
medium of a water wave is….water
What does a wave travel on?
A
wave travels on a MEDIUM
The
A
medium of a water wave is….water
medium of a sound wave is….. Air
What does a wave travel on?
A
wave travels on a MEDIUM
The
A
medium of a water wave is….water
medium of a sound wave is….. Air
The
medium of a slinky wave is…. The
slinky
Additional Terminology
•What does a wave move in?
•A MEDIUM
•What does a wave do?
•Transmit Energy from one place to another
•Medium is Not Transmitted
Types of Waves
Types of Waves
TRANSVERSE
Types of Waves
TRANSVERSE
This
is the most common type of wave
A sine wave is a transverse wave
Water is a transverse wave
Light is a transverse wave
Transverse Wave
CREST
WAVELENGTH
AMPLITUDE
EQUILIBRIUM
TROUGH
WAVE DIRECTION
MEDIUM DIRECTION
MEDIUM MOVES PERPENDICULAR TO WAVE DIRECTION
Parts of a Wave
What determines the amplitude?
Parts of a Wave
The amount of ENERGY put into it!
Types of Waves
Compressional
(Longitudinal)
Types of Waves
Compressional
Sound
(Longitudinal)
is a compressional wave
Longitudinal Wave
COMPRESSION
WAVELENGTH
RAREFACTION
WAVE DIRECTION
MEDIUM DIRECTION
MEDIUM MOVES PARALLEL TO WAVE DIRECTION
Types of Waves
TORSIONAL
Types of Waves
TORSIONAL
This
type of wave is created when ever the
medium is ‘twisted’
Ex.
Barber Pole or Candy Cane
Parts of a Wave
Frequency (f) – how many waves are
generated each second
Unit- waves/sec or cycles/sec which reduce
to Hertz
Parts of a Wave
Period (T) – Time to generate a single wave
Unit- seconds or seconds/wave
Parts of a Wave
Frequency-Period relationship
Inverse
f = 1/T
or
T = 1/f
Speed of a Wave
There are 2 methods to calculate the speed
of a wave.
Speed of a Wave
Method 1- is similar to what you did last
semester using distance traveled and time
Time how long it takes a crest to travel a
certain distance
Velocity = distance/time
Speed of a Wave
Method 2- using an idea you figured out
when you were very young
In
order to move faster one thing you
needed to do is move your feet faster
This is frequency
Speed of a Wave
Method 2- using an idea you figured out
when you were very young
Next
you realized that the longer your
stride was while you were moving your
feet faster also made you move faster
This is stride length (wavelength)
Speed of a Wave
Method 2- using an idea you figured out
when you were very young
The combination of the two result in the
velocity
Velocity = (frequency)(wavelength)