waves
DESCRIPTION
Waves. What is a wave?*. Energy is transferred through a wave . Mechanical waves- travel through a medium Electromagnetic waves- do not need a medium to travel Can you think of examples of each? Which one does this picture represent? - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/1.jpg)
![Page 2: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/2.jpg)
What is a wave?*Energy is transferred through a wave.Mechanical waves- travel through a mediumElectromagnetic waves- do not need a
medium to travelCan you think of examples of each? Which one does this picture represent?
Sound waves are mechanical because they need a medium to travel.
![Page 3: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/3.jpg)
Brain Pophttp://www.brainpop.com/science/energy/wav
es/
![Page 4: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/4.jpg)
What is sound?*Sound begins with a vibration.Sounds travel in waves through a medium.
![Page 5: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/5.jpg)
Mechanical Waves*Transverse Waves
The motion of the medium is perpendicular to the motion of the wave
Up and Down Waves
Longitudinal WavesThe motion of the
medium is parallel to the motion of the wave
Back and Forth Waves
**Sound Waves**
![Page 6: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/6.jpg)
Another View
![Page 7: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/7.jpg)
Longitudinal Waves*Compression
When waves are close together
RarefactionWhen waves are far
apart
![Page 8: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/8.jpg)
Transverse Waves*Crest- highest point
on a waveAmplitude- Volume
of a wave (height of a wave)As wave height
increases, volume increases
Measured in Decibels
Trough- lowest point on a wave
Frequency- Pitch, high or low (length of a wave)As wavelength
increases, pitch decreases
Measured in Hertz
![Page 9: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/9.jpg)
Amplitude versus FrequencyAmplitude
Which one will have the higher volume?
FrequencyWhich one will have
the higher pitch?
![Page 10: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/10.jpg)
What can you hear?Decibels (dB): Volume
Normal Speech: 60dBLibrary: 40dBClose Whisper: 20dBJet Engine: 140dBLoud Rock Music:
110dBSubway Train: 100dBBusy Street Traffic:
70dB120dB or above usually
causes pain to the ear
Hertz (Hz): Pitch Young people can
hear frequencies between 20-20,000 Hz
Dogs can hear frequencies that range from 67-45,000 Hz
As you age, your ability to hear high frequency sound decreases.
![Page 11: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/11.jpg)
Now you will create a diagram for the parts of a wave.
Use string and tape. An example is on the next slide.
![Page 12: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/12.jpg)
Diagram of a Transverse Wave*CREST
TROUGH WAVELENGTH
AMPLITUDE
![Page 13: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/13.jpg)
Cool Waves!http://paws.kettering.edu/~drussell/Demos/
waves-intro/waves-intro.html http://sunshine.chpc.utah.edu/labs/waves/
wave_basics/waves.htm http://paws.kettering.edu/~drussell/Demos/
waves/wavemotion.html
![Page 14: Waves](https://reader035.vdocuments.us/reader035/viewer/2022062519/56815295550346895dc0bc06/html5/thumbnails/14.jpg)
United Streaminghttp://player.discoveryeducation.com/
index.cfm?guidAssetId=75244603-66D0-4066-9608-85B309BD65FC&blnFromSearch=1&productcode=US