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# Waves

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by

## sunbin back

on 5 May 2016

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#### Transcript of Waves

vibration is perpendicular to the propagation of the wave
Types of Waves
Mechanical waves
:waves that require matter to transfer energy

Transverse wave
Longitudinal Wave
the medium moves forward and backward along the direction the wave travels
Components of Transverse Waves
Crest
: the high point on the wave
Amplitude
Trough
: the low point on the wave
wavelength
: the distance from the top of one crest to the top of the next crest
Frequency

the number of wavelengths that pass a given point in 1 second.
Examples
sound wave
is a mechanical wave that can travel through air, solids, liquid and other gases.
Without a medium, there would be no sound waves

Properties of waves
Reflection
Refraction
Diffraction
Interference
Echo
transfers energy in a
MEDIUM
substance or material that carries the wave
example:
water
,
air
,
glass
Refraction is the bending of wave as it moves from one medium into another
*
WAVES can only exist if there is energy that they can carry!
Experiment
each
sound
is produced by the force or pressure from the vibration of an object.
when you speak, there is a
vibration
happening in your throat which creates
sound waves
.
Diffraction
is the bending of waves around a barrier
Experiment
The ability of two waves to combine and form a new wave when they overlap
Interference
Constructive Interference
larger wave
Destructive Interference
two pulses completely destroy each other
FREQUENCY
AMPLITUDE
AMPLITUDE
= VOLUME
FREQUENCY
= PITCH

The Electromagnetic Spectrum
lowest frequencies
carry the least energy
PROPERTIES OF SOUND WAVES
REFLECTION
REFRACTION
Refraction is the bending of waves when they enter a medium where their speed is different.
Experiment of reflection
DIFFRACTION
Television signals-how?
radio waves cause electrons in another piece of metal(antenna) to vibrate.
an alternating current forms
a picture is produced on TV screen
Microwaves
used to transmit phone calls
Heating Food
Infrared Waves
Vegetation
Night Vision Devices
Visible light
is electromagnetic waves you can detect with your eyes
Sterilize goggles
disinfect surgical equipment
The major
source of
ultraviolet
USES OF ULTRAVIOLET WAVES
Ozone Layer
X-rays
Gamma Rays
Nuclear explosions
Lightning
Tumor
kill bacteria in food
RESONANCE
RESONANCE=When one object is vibrating at the same natural frequency of the second object forces into vibrational motion.
EXPERIMENT
DOPPER EFFECT
DOPPER EFFECT= the change in frequency that occurs when a source of sound is moving relative to a listener. Dopper effect occurs when a sound source or a listener is moving.
Pause the presentation and play the video
SPEED
go through skin and damage cells inside.
Dense materials needed for prevention
(specialized equipment required)
KIDNEY DAMAGE
DNA DISORDER
LUNG CANCER
* a stream of small
"packets"
of energy called
photons
.
light, short-ranged particle, and is actually an ejected electron
CELL MUTATION
HAIR LOSS
SKIN INJURY
by SunBin & Inhye
PET Scan
MRI
Magnetic Resonance Imaging

Applications of EMS in Medicine
PET Scan
MRI
CT Scan
Components of Longitudinal Wave
Positron Emission Tomography
A form of glucose

1. Alter Magnetic Field
2)The hydrogen ions orientate into different direction

3)The magnetic field is changed

4) The hydrogen ions orientate into different position, and they give out waves

5) The waves are detected by the antenna

6)The antenna feeds the information to the computer

7) The software uses the data to turn it to an image

CT scan
Computerized Tomography
uses x-rays to create pictures of cross-sections of the body.
Infrared waves are used to treat pain as well
To treat jaundice
Waves
https://quizlet.com/82492864/flashcards
Quiz
EXTRA:) INFORMATIONS!!!
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