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Welcome to 306!

Welcome to 306!. Today is a new marking period – a new start! DO NOW: Please write three goals you have for yourself in Integrated Science for the second marking period. Do Now Chapter 11, Waves 11/28/11. Take out 11.1,2 and 12.1,2 H/W vocab cards COLLECTED AND GRADED

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Welcome to 306!

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  1. Welcome to 306! • Today is a new marking period – a new start! • DO NOW: • Please write three goals you have for yourself in Integrated Science for the second marking period.

  2. Do NowChapter 11, Waves11/28/11 • Take out 11.1,2 and 12.1,2 H/W vocab cards • COLLECTED AND GRADED • What are the 2 main types of waves

  3. Do NowChapter 11-12, Waves11/29/11 • Take out 11.1 Chapter Review H/W • Draw a transverse and longitudinal wave • Show direction of particle movement in each wave

  4. Types of Waves • Section 11.1

  5. Waves • A disturbance that transmits energy through matter or space

  6. Waves • Most waves move through matter called a medium. • Ex. Waves traveling through water.

  7. Types of Waves • 1. Mechanical Waves a wave that requires a medium through which to travel • Most type of waves Ex. Sound, seismic

  8. Types of Waves • 2. Electromagnetic Waves waves caused by the disturbance in electric and magnetic fields and that does not require a medium. (light radiation waves)

  9. What do Waves Do? • When waves travel through media they are doing work (energy transferred). • Ex. Sound traveling in your ear causes vibrates throughout your ear

  10. What do Waves Do? • Ex. Shock waves move the earth during an earthquake. • Ex. Tsunami waves move anything in their path

  11. Shock wave from breaking the sound barrior.

  12. How a Wave Travels • As wave travels in air, the waves spread out in spheres • the sphere will get bigger and bigger as they move farther away

  13. How a Wave Travels • Why is it more damaging to your ears if you are standing next to a speaker rather than a 100 meters away?

  14. How a Wave Travels • Each sphere carries the same amount of energy • But the energy is more spread out of a greater distance.

  15. Speaker Sound waves

  16. Vibrations and Waves • Most waves are caused by a vibrating object, which will then cause other objects to vibrate • Vibrations will transfer energy from PE to KE.

  17. Vibrations and Waves • simple harmonic motion--vibration would continue forever • Damped harmonic motion transfers the energy and the vibration will fade out. • Ex. Shock absorbers on cars and bikes.

  18. Wave Vibration Types • 1. Transverse Waves -a wave that causes the particles of the medium to vibrate perpendicular to the direction of the wave. • “The Wave” at a stadium is a good illustration. • Ex. Light waves

  19. Wave Vibration Types • 2. Longitudinal Waves -a wave that causes the particles of the medium to vibrate parallel to the direction of the wave. • they expand and compress. • Ex. Sound waves

  20. Wave Vibration Types • 3. Surface Waves -waves that are both transverse or longitudinal. -Circular motion -ex. Ocean waves

  21. Wave Types • Mechanical waves: -can be transverse, longitudinal , or surface waves • Electromagnetic (light): -waves will only be transverse.

  22. DO NOW EAWV SCCARHATRISTECI UNSCRAMBLE THE TERMS ABOVE TO FIND OUT WHAT WE ARE LEARNING ABOUT TODAY! Be Ready to hear an important message!

  23. Characteristics of Waves 11.2

  24. Wave Properties • all transverse waves have similar shapes, no matter the size of the wave. • The shape is called a sine curve or sine wave.

  25. Sine Wave

  26. Wave Parts • Crest Highest point of a transverse wave • Trough lowest point of a transverse wave

  27. Wave Parts • Amplitude -The vertical distance that particles vibrate from their normal position when a wave passes • measures the intensity of wave. -ex. Loudness, brightness

  28. Wave Parts • Wavelength -The distance between any two successive identical parts of a wave • Represented by the symbol lambda () • Measured in a degree of meters

  29. Wave Diagram Wavelength Amplitude Crest trough Wavelength

  30. Wave Properties • 1. Wavelength -measures the size of the wave

  31. Wave Properties • 2. Amplitude -measures the intensity (strength) of the wave

  32. Wave Properties • 3. Frequency -the number of full wavelengths that pass a point in a particular period of time (rate) -Represented by the symbol (ƒ) -Measured in hertz (Hz) = beat/sec -Your radio dials are in megahertz

  33. Wave Properties • 4. Period (time) -The time required for one full wavelength to pass a certain point -Represented by the symbol (T) -Measured in seconds

  34. Low Low Wavelength High High

  35. Frequency, wavelength, and Period • Wavelength and period will increase when frequency decreases. • λ ↓, T, ↓, then f ↑

  36. Frequency and Period • You can calculate frequency and period from each other • T=1/f or f=1/T

  37. Frequency and Sound • We hear sounds from the range 20 Hz to 20,000 Hz • determines the pitch

  38. Pitch and Loudness

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