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Wave Properties

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by

Dan Alba

on 15 November 2013

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Transcript of Wave Properties

Wave Properties


Waves Properties
Wave Length
Many people think when they hear wavelength is how long the wave is. However there is much more than just how long the wave is!
Wavelength
*Wavelength
is the distance between one point of a wave and the closest point just like the wave.
*Wavelength for sound waves start form the
highest
pitch sound to the
deepest
sound.
Wavelength for Compressions
To measure a wavelength in a compressional wave can be measured from the start of the compression to the other side of compression, also to rarefaction to rarefaction.
Wavelength
Frequency and Period
Have you ever changed the radio to a different station? If so radio waves also have frequency to change to the next station!
Frequency


In this presentation you will learn the things that form a wave. Also the different kinds of waves.
What is a wave?
*
Wave
-is a rhythmic disturbance which carries energy through space or matter
Many waves have an energy called an
Medium
.
There are two different types of waves!
*
Transverse wave
*
Compression wave
The
Two
Waves!
Transverse Wave
*Transverse wave-
the waves medium moves in a perpendicular motion to the direction of the wave
*Example as the wave moves left to right the medium moves up and down.
Compression Wave
*
Compression wave
-
vibrates in the direction that the wave is traveling
.

Example, a sound of the slinky

*
Frequency-
is the number of waves that pass a given point in one second.
*
Hertz(Hz)
is the Si unit for frequency
*
1Hz
is equal to one wave passing through a given point in
1
second.
Say you are sitting on a boating dock, and
one
wave washed upon the dock every second the frequency would be
1 Hz
Frequency
Wavelength
Period
*
Period
-
is the amount of time it takes a wavelenth ro pass a point.
Wavelength
and
Frequency.
If you make Transverse waves with a string the
frequency
will
increase
, also moving the string faster will make the
wavelength

decrease
.
As frequency increases wavelength decreases.

Are all waves the same?
Wave speed
Not all waves are the same, just like human waves are different from each other also. Waves can differ by how much
energy
they transfer and how fast they go.
*
Wave speed
is the speed of a wave that depends on the medium it is moving through.
Wave speed
*
Sound waves
travel faster in liquids and solids than in gasses or empty spaces.

Parts of a Wave
Wave speed

*
Crest
, are the high points in a wave.
*
Troughs
, are the low points in a wave
Crest and Trough
Parts of a Wave
.
Compressional wave
has
no
crest or troughs. The wave is made of compressions and rarefactions that travel through the medium. Therefore the wave becomes crowded together.However
Transver waves
have many crest and troughs.
*
Rarefactions
, are the less dense region in a compressional wave.
Also sound waves travel
faster
in places were the temperature is increased
Wave speed
For example sound waves would travel
faster
in
20
degrees Celsius and
slower
in
0
degrees Celsius
Frequency
Frequency and Wavelength
*
However light waves are faster.
The End!!
Credits
/

Websites
*
Google
*
Google Images
*
Dictonary.com
*
Mrs.Kenney science textbook
*
YouTube
By:

Alyssa Murillo, Ruben Little, Daniel Alba, Abbie Edwards

Video
Video
*While the
frequency
will
increase
the
period
will
decrease.
Calculating Wave Speed
To calculate the speed of a wave you will have to use these terms:
Wave speed, Frequency
and
Wavelength.
*
Frequency
is represented by
f
*
Wavelength
is represented by a greek letter called
lambda
Equation
*
Wave speed
is represented by
v
*
speed
(in m/s)
=

frequency
(in Hz)
x

wavelength
(in m)
Wavelength
* The symbol above is the greek letter lambda. However is represented by wavelength
Example
What is the speed a sound wave that has a
wavelength
of
2.00m
and a
frequency
of
170.5 Hz
?
Solving
*
Wavelength
of 2.0m = (symbol) 2.00m
*
Frequency
of 170.5 Hz = f 170.5 Hz
* The speed of the
sound wave
= v ? m/s
Now put you equation together
v= f(wavelength symbol)

v
=
170.5 Hz

x

2.00m
=
341 m/s

MINI LAB
!!
Amplitude
Why is it that some earthquakes cause bad damage while others don't leave a mark?
This is because of
Amplitude
!!
Amplitude and Energy
*
Amplitude
is related to the energy made by a wave
*The
greater
the waves amplitude the more
energy
the wave transverse
Compressional Wave
*The amplitude of a
compressional wave
depends on the
density
of the
medium
in the compressions and rarefactions
*Compared to
lower
amplitude wave coils are
closer
together in compressions.
Transverse Waves
* The amplitude of a
transverse wave
is the distance between
crest
or a
trough
, also the postilion of the medium at rest.
Video
Full transcript