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WAVES AND SOUND
Create your own wave
You are to create as many waves as possible without using your hands. You can use various items at your desk to create a wave but remember you can’t use your hands.
Let’s talk about your observation!
What is energy? Energy is the ability to move or cause change in matter.
There are two types of energy, kinetic and potential, and it comes in many forms:
Sound- kinetic Thermal-kinetic Chemical-potential Electrical- kinetic Radiant/ Light-
kinetic Mechanical- kinetic
Potential- when matter has stored energy that is ready to be used but is not being used.
Kinetic-the release of potential energy; matter in motion
Waves have energy but what is a wave?
A wave is the ability to move or cause change in matter.
What is a wave?
A disturbance that transfers energy. Some types of waves require a medium (solid, liquid, or gas) to travel through while others do not.
A medium is a substance or material that carries a wave (solid, liquid, gas)
What is a medium?
A medium is a substance or material that carries a wave (solid, liquid, gas)
DIFFERENT TYPES OF WAVES:
• Mechanical Wave• Electromagnetic
Wave• Transverse Wave• Longitudinal Wave
Mechanical v/s Electromagnetic Waves
Mechanical Waves travel through matter
Sound waves water waves
Electromagnetic Waves travel through empty
space, as well as through matter
Visible light, microwaves, X-rays, and radio waves
What is inertia?What does it have to with waves? Object in
motion will keep moving at the same speed and in the same direction unless force change their motion
Mechanical Wave
Require a type of matter to travel through
Medium- (solid, liquid, gas)
These waves pass on energy
Waves can create sound Sound can travel
through air, water, or solids
Can not travel through a vacuum( no air)
Electromagnetic Wave
Waves that can travel through a vacuum
Empty Space They do not need a
medium or matter Examples:
Light wave Radio waves X-rays
Waves Activity #1
Since waves are usually unseen, we are going to make these waves ourselves using Slinkys.
Are we creating mechanical waves or electromagnetic waves? Explain your reasoning.
What did you observe?
Transverse Wave
The wave is moving left to right, while the disturbance moves up and down
The disturbance moves perpendicular to the direction of the wave
Transverse waves create light
What is a crest?
The peak, or highest point of a transverse wave.
What is a trough?
The valley, or lowest point, of a transverse wave.
What is the difference between a trough and a crest?
What is a wavelength?
The distance from any point on one wave to a corresponding point on an adjacent wave.(ex. Crest to crest or trough to trough)
Now let’s label the parts of a wave in your notebooks.
LET’S MOVE!Tie a rope to the a chair and create long and short wavelengths.
Question: 1. What do you notice about the frequency? 2. What happens when you move it very fast,
in an up and down movement?3. What happens when you move it slowly in
an up and down movement?4. Does frequency increase or decrease when
wavelength is reduced?
What is frequency?
The number of oscillations produced in a certain amount of time. The greater the number of oscillations per second, the higher the frequency. The higher the frequency, the more energy carried by the wave.
High Energy
Low Energy
Tell me some places where you have seen frequency
waves?
What type of frequency is this?
How do you know?
What type of frequency is this?
How do you know?
Can you tell them apart?
Which is the high and low? How do you know?
Transverse v/s Longitudinal WaveTransverse waves produce light
Longitudinal waves produce sound
Compressional/Longitudinal Wave The disturbance
moves in the same direction as the wave
These waves create sound
Examples: Sound waves Waves moving
through a stretched out slinky or spring
Rarefaction- the part of the wave that is moving apartCompression- is a squeezing together of something; the part of the a sound wave in which air is pushed together
Give me some examples in which you see and hear
transverse and longitudinal waves.
Waves Activity #2
Directions With the slinky,
create transverse wave with your group.
Now create a longitudinal wave with your group
Complete in NotebookCompare and Contrast the two waves you created with your group.
Record your observations:
See Hear Feel
EARTHQUAKES
Earthquakes develop in the crust of the earth.
The inner part of the earth contains massive energy.
Some of the energy escapes through cracks within the earth’s surface.
Waves are what cause us to experience earthquakes
Three types of earthquake waves
Seismic wave is an elastic wave generated by an impulse such as an earthquake or an explosion
P-Waves: Also called
compressional wave Is seismic body wave
that shakes the groud S-Waves:
Also called shear wave
Is a seismic body wave that shakes the ground
L-Waves:
