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May 12, 2014

May 12, 2014. Homework: Read pages 15-16 (Stop at Longitudinal Wave) in Sound and Light textbook- Define bold terms. -Unit vocabulary sheet due Friday Do Now : Write down homework Open textbook to pg. 14 Open notebook to page 30. What are Waves?.

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May 12, 2014

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  1. May 12, 2014 Homework: Read pages 15-16 (Stop at Longitudinal Wave) in Sound and Light textbook- Define bold terms. -Unit vocabulary sheet due Friday Do Now: Write down homework Open textbook to pg. 14 Open notebook to page 30

  2. What are Waves?

  3. A wave is a disturbance that transfers energy from place to place. How does a wave travel?

  4. Medium: The material that a wave travels through • Solids- Like ropes • Liquids- Such as water- • Water waves use the medium of the surface of the water to travel.

  5. Gases- Like air- For Sound Waves

  6. Homework: Work on Unit Vocabulary Sheet- Due Friday Work on Vocabulary Card Do Now: • Write Down Homework • Open notebook to pg. 30 • Open textbook to pg. 15 May 13, 2014

  7. Waves are created when a source of energy causes a medium to vibrate. How are waves created?

  8. A Vibration- is a repeated back and fourth or up and down motion

  9. Waves travel through a medium, but do they carry the medium itself along with it as it travels? – Look at Figure 1 on pg. 15- What happens to the top of the wave over time? Waves and Energy • -A wave moves through the medium (water), but it does not carry the medium along with it.

  10. -Waves are classified according to how they move • Waves that move the medium at right angles to the direction that the waves are traveling. • -Move in one direction- Waves that move up and down or side to side. Transverse Waves

  11. Crest- Highest parts of the wave Trough- The lowest part of the wave

  12. ~Homework: Read /review the words & diagrams on pages 18-21 in T.B ~Do Now~ • Write down homework • Open textbooks to page 16, Open notebooks to pg. 31. Title 31- Other types of waves • Read pg. 16- Longitudinal Waves and page17- • Then Define bold terms- in notebook on pg. 31 May 14, 2014

  13. Compressions- the parts that are close together Rarefactions- Parts where the coils are spread out Energy travels parallel along the spring toy-creating a wave- once the wave passes each coil goes back to normal Longitudinal Waves

  14. Combination of Transverse and Longitudinal Waves. -Circular type motion Surface Waves

  15. May 15, 2014 • Homework: Questions on the board------------ • Finish wave diagrams if not finished in class. • Quiz on Section 1 and Section 2 on Wednesday 5-21 Do Now: • Write Down homework & Quiz information • Take out both Wave diagrams- Transverse (folded sheet of paper) and Longitudinal (half –sheet of paper) • Open textbook to pg. 18- Open notebook to page 32

  16. Amplitude • Wavelength • Frequency • Speed Properties of Waves

  17. Amplitude- The measure of how far a particle in the medium moves from rest when disturbed by a wave. Amplitude is a direct measure of the waves energy (From Rest –Crest) It is the maximum distance the medium moves above or below the rest position. (From rest to trough)

  18. Wave length- Distance between two corresponding (alike) parts of a wave- Transverse Wave Crest to Crest Wavelength Measured from Trough to Trough

  19. Longitudinal wave- Wavelength is measured from compression to compression

  20. Measured by how compressed or rarefied the medium become. • The more crowded the compressions = the larger the amplitude. Amplitude- Longitudinal Wave

  21. Wave length- Distance between two corresponding (alike) parts of a wave- Transverse Wave Crest to Crest Wavelength Measured from Trough to Trough

  22. May 16, 2014 Homework: -Review notes for quiz on Wednesday – May 21 -Complete review work sheet on Labeling Waves Do Now: -Write down homework -Take out Wave diagrams -Open textbook to pg. 19 -Open notebook to page 32

  23. Amplitude- The measure of how far a particle in the medium moves from rest when disturbed by a wave. Amplitude is a direct measure of the waves energy (From Rest –Crest) It is the maximum distance the medium moves above or below the rest position. (From rest to trough)

  24. Measured by how compressed or rarefied the medium become. • The more crowded the compressions = the larger the amplitude. Amplitude- Longitudinal Wave

  25. Wave length- Distance between two corresponding (alike) parts of a wave- Transverse Wave Crest to Crest Wavelength Measured from Trough to Trough

  26. Longitudinal wave- Wavelength is measured from compression to compression

  27. The number of complete waves that pass a given point in a certain amount of time. Frequency = (Wave)speed Wavelength Frequency- Measured in hertz(Hz) Ex: To increase the frequency you need to increase the amount of vibrations.

  28. 1. Waves are…… vibrations in a medium- Frequency= Number of Vibrations(Waves) that pass per second- 2. Frequency- • EX: If waves on a rope pass by every second, the frequency is 1 wave per second (1 Hz) 3.

  29. Why do you see the lightning before you hear the thunder?? • Lightning and Thunder~~Speed of Sound vs. Speed of light! Who is faster???? ~~~~Speed of a wave~~~~ Speed = Wavelength x Frequency

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