1. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Examining Waves

2. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Agenda Bill Nye video Parts of a wave Types of waves Why waves are important Various demos and classroom examples included Also, check out this site for some great lessons and applets! http://www.physicsclassroom.com/Class/waves/

3. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Bill Nye and Understanding WAVES

4. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Parts of a Wave A wave is a disturbance in a medium

5. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Types of Waves

6. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Sound waves visualized Rueben’s Tube http://www.youtube.com/watch?v=HpovwbP GEoo

7. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Torsional waves Tacomo Narrows Bridge http://www.youtube.com/watch?v=3mclp9QmCGs

8. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Beat frequencies When 2 sounds (notes) are played at the same time and the frequencies differ by a small amount, a beat can be heard. Example 1: Note #1 = 345Hz Note #2 = 347Hz Difference = 2Hz Therefore a beat will be heard. Example 2: Listen…

9. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Doppler Effect Christian Doppler proposed in 1842 Frequency heard by obs. Velocity of sound Velocity of source (going away +ve, coming toward –ve) Frequency generated by obj.

10. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Why are waves important?

11. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Applications Sound… Travels in solids, liquids and gases It can be measured Microwaves Heat our food Can be used to measure the speed of light Ultrasounds, MRIs, CT, X-rays All can be used in medicine Doppler, RADAR, LASER Science inventions that use the properties of waves

12. KATARIN MACLEOD Katarin MacLeod NUMERACY TECHNOLOGYTECHNOLOGY LITERACY SERVICE APPLICATION Resources http://www.physicsclassroom.com/mmedia /waves/gsl.cfmhttp://www.physicsclassroom.com/mmedia /waves/gsl.cfm http://www.billnye.com/index.asp http://imagine.gsfc.nasa.gov/docs/science/ know_l1/emspectrum.htmlhttp://imagine.gsfc.nasa.gov/docs/science/ know_l1/emspectrum.html http://phet.colorado.edu/simulations/sims.p hp?sim=Wave_on_a_Stringhttp://phet.colorado.edu/simulations/sims.p hp?sim=Wave_on_a_String