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It’s All About Waves Section 1 This powerpoint presentation requires Windows XP

It’s All About Waves Section 1 This powerpoint presentation requires Windows XP. Slide 1. What do all of these images have in common ?. Slide 2. They all contain a wave !!!. water. light. microwave. radio. sound. Slide 3. So what is a wave ? ? ? ?.

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It’s All About Waves Section 1 This powerpoint presentation requires Windows XP

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  1. It’s All About WavesSection 1This powerpoint presentation requires Windows XP Slide 1

  2. Whatdoalloftheseimages haveincommon? Slide 2

  3. Theyallcontainawave!!! water light microwave radio sound Slide 3

  4. Sowhatis a wave???? A wave is any disturbance that transmits energy through matter or space. Slide 4

  5. Sowhatis a wave???? Click here to answer the next few questions on your worksheet. Slide 5

  6. How???? Somewavestransferenergybyvibration…. Draw the movement of avibration onyour paper. Slide 6

  7. How???? Wavesthattransferenergybyvibration requirea medium. Slide 7

  8. How???? Themedium can beinoneofthreeforms. Solid Liquid Gas Slide 8

  9. Waves that require a mediumarecalled: Mechanical waves Name two example of waves that require a medium. Click again for a hint. Slide 9

  10. Waves that donotrequire a mediumarecalled: Electromagneticwaves Name five example of waves that don’t require a medium. Hint-click on the next page. Slide 10

  11. Electromagneticwaves Need help? Click enter to show the boxes. Slide 11

  12. Electromagneticwaves All electromagnetic waves are transverse waves. Slide 12

  13. Section 2 Slide 13

  14. What are sound waves? Click here to answer the questions on your worksheet for Slide 14. Slide 14

  15. Does the medium affect the speed of sound? Use the chart on the following pages to answer this question. Slide 15

  16. Altitude = Feet above sea level MPH = miles per hour, the larger the mph, the faster the sound travels. Chart taken from: http://home.iae.nl/users/wbergmns/jetmach1.htm At 20,000 ft above sea level, how fast does sound travel (in mph)? Slide 16

  17. Altitude = # of feet/meters above sea level MPH = miles per hour, the larger the mph, the faster the sound travels. Chart taken from: http://home.iae.nl/users/wbergmns/jetmach1.htm 1. Does sound travel faster at 30,000 ft above sea level or 10,000 ft above sea level? Slide 17

  18. Altitude = # of feet/meters above sea level MPH = miles per hour, the larger the mph, the faster the sound travels. Chart taken from: http://home.iae.nl/users/wbergmns/jetmach1.htm 1. This chart is measuring the speed of sound in what type of medium? Solid, Liquid, or Gas Slide 18

  19. Altitude = # of feet/meters above sea level MPH = miles per hour, the larger the mph, the faster the sound travels. Chart taken from: http://home.iae.nl/users/wbergmns/jetmach1.htm 1. Does the temperature increase or decrease as the altitude rises? Slide 19

  20. How Fast Does Sound Travel? 1. What is the speed of sound in water? Slide 20

  21. How Fast Does Sound Travel? 1. Does sound travel faster in a solid medium or a gaseous medium? Slide 21

  22. How Fast Does Sound Travel? 1. There are three different temperatures listed for air. Given this information, do you think that the speed of sound would be the same or different for hot water and cold water? Explain your answer. Slide 22

  23. Section 3 Slide 23

  24. Sir Isaac Newton • Newton was interested in the properties of light. • In 1666, he designed an experiment in which he took two prisms and flashed two rainbows on the wall using sunlight. He then moved the prisms until they were on top of each other. The result was white light. • Newton led the way for all other scientists to study light and the electromagnetic spectrum. Source: NASA Slide 24 3R-46.0

  25. What is light? • Light can be thought of as a wave of electric and magnetic energy. Hence, it is called an electromagnetic wave. • The two forms of energy flow perpendicular to each other. • Light waves are waves of energy that can vary in size and shape. Magnetic Energy Wave Electric Energy Wave Light Wave Slide 25 3R-42.0

  26. Click here to answer questions 24-26 on your worksheet. Slide 26

  27. Light Waves Slide 27

  28. Where do you think the light beam is the brightest? A or B Why? Click to the next slide to find out… Slide 28

  29. LIGHT ABSORPTION When you shine a light. Light waves transfer energy. The energy extends out. As the light beam travels, some of the energy is absorbed by air particles. Slide 29

  30. But wait! There is another reason! Slide 30

  31. LIGHT SCATTERING When you shine a light. Light waves transfer energy to air particles. BUT Air particles can release some of that energy that they had absorbed. When the light is released it scatters. This scattering lets you see light outside the light beam, but it is dim because the light has been scattered. Slide 31

  32. READYFORANOPTICAL ILLUSION? Slide 32

  33. If youshinealightintoatankofwater,whathappenstothe light beamswhen they hit the water? a. The light beam bends b. The light beams stays straight Click for your choices Slide 33

  34. RFATO ERCIN What isthis called? Slide 34

  35. RFATO ERCIN In this example, the lightwaveismoving throughtwomediums, what are they? • Solid and gas c. Gas and solid • Solid and solid d. Gas and liquid Slide 35

  36. Why does the light bend? • When the light moves from one medium to another, such as from air to glass, it slows down. • When the light hits the glass at an angle, the waves that hit first slow down first. • The waves that don’t hit the glass first are still going at their same, fast speed until they hit the glass. This side of the light wave keeps going at its same speed. This side of the light wave slows down when it hits the glass. Slide 36 3R-48.0

  37. RFATO ERCIN 2. To the left of the cup of water Click here and view the broken pencil activity. Draw a picture to describe what you see when you place a pencil in water. 3. To the far side of the cup water 1. Middle of the cup Slide 37

  38. LIGHT INTERACTS WITH MATTER 3 DIFFERENT WAYS Slide 38

  39. REFLECTION Slide 39

  40. ABSORPTION Slide 40

  41. TRANSMISSION Transmission is the passing of light through matter. So….is light transmitted through a window Slide 41

  42. TRANSMISSION If light is transmitted through an object it is said to be transparent. Transparent objects could be air, water, and clear glass. Slide 42

  43. TRANSMISSION If light the is transmitted and scattered it is said to be translucent. This shower door is an example of a translucent object. Slide 43

  44. TRANSMISSION If light is not transmitted through the object, it is said to be opaque. Light can’t go through the books Or through this wall Slide 44

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