Download Waves

Science Starter
What are waves?
Science Starter Answer
Waves are vibrations that transfer energy from
place to place without matter !
(solid, liquid or gas) being transferred.!
Energy Waves
Ms. Dale
Waves
Waves are vibrations that transfer energy from place to place
without matter (solid, liquid or gas) being transferred.!
Vibrations in materials may produce waves that spread from a
source of a disturbance in all directions!
!
!
Ex: An earthquake epicenter causes seismic waves!
Waves
Some waves travel through a substance called a medium and it
is the medium that vibrates as the wave travels through it!
!
Ex: Sound waves travel through the medium of air!
Some waves transfer through a medium, but do not need to.
They can travel through empty space.!
!
Ex: Electromagnetic radiation
Wave Measurements
Waves can be measured by the following:
Amplitude
Wavelength
Frequency
Amplitude
Amplitude-As waves travel, they set up patterns of
disturbance. The amplitude of a wave is its maximum
disturbance from its undisturbed position.!
POP QUESTION
What determines a wave’s amplitude?
ANSWER
What determines a wave’s amplitude?
A wave’s amplitude depends on the energy of the
disturbance that causes the wave.
Ex: Thowing a small rock into water will cause tiny ripples
which are low-amplitude waves. If you threw a boulder into
the water it would cause large waves that are highamplitude.
Wavelength
Wavelength is the distance between a point on one
wave and the same point on the next wave. !
It is often easiest to measure this from the crest of
one wave to the crest of the next wave, but it doesn't
matter where as long as it is the same point in each
wave.!
Wavelength
Wavelength
Wavelength
The wavelength is related to the energy of a wave!
Short-wavelength waves have more energy than longwavelength waves of the same amplitude!
Frequency
Frequency-is the number of waves produced by a
source each second. It is also the number of waves
that pass a certain point each second.
POP QUESTION
What types of energy do NOT travel in waves?
ANSWER
Kinetic energy, potential energy, and
chemical energy
do NOT travel in waves.
Bill Nye:
Waves
https://www.schooltube.com/video/
2b2001da6d8146dbb388/Bill%20Nye%20-%20Waves
Science Starter
Name two types of energy that travel in
waves.
Science Starter Answer
Light energy, sound energy, heat energy, and
any form of electromagnetic radiation !
travel in waves!
Energy Waves
Continued
Ms. Dale
Types of Energy That
Travel In Waves
Light energy
Sound Energy
Heat Energy
Any form of electromagnetic radiation
Wave Mediums
A medium is a material that a wave moves through.!
All kinds of waves transfer energy, but the medium is never
transferred with the wave!
What is the medium that the wave is traveling through
in the image above?
Wave Mediums
Examples
Water can be a medium that a wave !
transfers energy through
Wave Mediums
Examples
Air can be a medium that a wave !
transfers sound energy through
Wave Mediums
Examples
A guitar string can be a medium that a wave !
transfers energy through
Wave Mediums
Examples
The crust of the Earth a medium that a seismic wave !
transfers energy through
Wave Anatomy
Rest Point
A crest is the highest point the medium rises to !
A trough is the lowest point the medium sinks to.!
A rest point where the medium is when no wave is
moving through it
Making Waves Lab
We will make waves with a rope and compare the
wavelengths of low energy waves with higher
energy waves
Waves Interactive
You will use a website to manipulate waves by
inputting and record your observations
http://phet.colorado.edu/en/simulation/wave-on-a-string
Science Starter
Draw the waves above and correctly label
each number.
Science Starter Answer
1. wavelength!
2. amplitude!
3. crest!
4. trough!
Energy Waves
Continued
Ms. Dale
The Difference Between
High Energy and Low Energy Waves
Waves Interactive
You will use a website to manipulate waves by
inputting and record your observations
http://phet.colorado.edu/en/simulation/wave-on-a-string
Nova Tune Correction
NOVA scienceNOW talks to the engineers behind Auto-Tune, the pitch-correction
software that turns sour notes into sweet ones. Professional musicians from
Madonna to Snoop Dogg use Auto-Tune, but can the software turn host Neil
deGrasse Tyson into a singing star?
!
NOVA (8 mins-watch from 31:10-38:04)
http://www.pbs.org/wgbh/nova/tech/auto-tune.html