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Waves

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?

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Waves

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  1. Waves

  2. 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? • Sound waves are mechanical because they need a medium to travel.

  3. Brain Pop • http://www.brainpop.com/science/energy/waves/

  4. What is sound?* • Sound begins with a vibration. • Sounds travel in waves through a medium.

  5. Mechanical Waves* Transverse Waves • The motion of the medium is perpendicular to the motion of the wave • Up and Down Waves • Longitudinal Waves • The motion of the medium is parallel to the motion of the wave • Back and Forth Waves • **Sound Waves**

  6. Another View

  7. Longitudinal Waves* Compression • When waves are close together Rarefaction • When waves are far apart

  8. Transverse Waves* • Crest- highest point on a wave • Amplitude- 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

  9. Amplitude versus Frequency Amplitude • Which one will have the higher volume? Frequency • Which one will have the higher pitch?

  10. What can you hear? Decibels (dB): Volume • Normal Speech: 60dB • Library: 40dB • Close Whisper: 20dB • Jet Engine: 140dB • Loud Rock Music: 110dB • Subway Train: 100dB • Busy Street Traffic: 70dB • 120dB 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.

  11. Now you will create a diagram for the parts of a wave. • Use string and tape. • An example is on the next slide.

  12. Diagram of a Transverse Wave* CREST AMPLITUDE TROUGH WAVELENGTH

  13. 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

  14. United Streaming • http://player.discoveryeducation.com/index.cfm?guidAssetId=75244603-66D0-4066-9608-85B309BD65FC&blnFromSearch=1&productcode=US

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