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Waves, Light and Sound March 18, 2006 BY: BRIANNA SHIELDS March 18, 2006 BY: BRIANNA SHIELDS.

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Presentation on theme: "Waves, Light and Sound March 18, 2006 BY: BRIANNA SHIELDS March 18, 2006 BY: BRIANNA SHIELDS."— Presentation transcript:

1 Waves, Light and Sound March 18, 2006 BY: BRIANNA SHIELDS March 18, 2006 BY: BRIANNA SHIELDS

2 DO NOW(Homework out on desk please)  1. A rainbow is an example of which of the five main types of energy?  2. Sound is an example of which of the five main types of energy?  3. The digestion of food is an example of which of the five main types of energy?  1. A rainbow is an example of which of the five main types of energy?  2. Sound is an example of which of the five main types of energy?  3. The digestion of food is an example of which of the five main types of energy?

3 GOAL  To explain the relationship between wavelength and frequency  To recognize the electromagnetic spectrum  To explain the relationship between wavelength and frequency  To recognize the electromagnetic spectrum

4 Electromagnetic Spectrum  Electromagn etic spectrum WAVES OF ELECTRIC particles traveling at the speed of light

5 Long wavelength Low Energy Low Frequency

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9 Using the Electromagnetic Spectrum  What is visible light found between?  Infrared and uv light  Which color make up the spectrum of visible light?  ROYGBIV- red, orange, yellow, green, blue, indigo, violet  What is visible light found between?  Infrared and uv light  Which color make up the spectrum of visible light?  ROYGBIV- red, orange, yellow, green, blue, indigo, violet

10 Using the Electromagnetic Spectrum  Which has a longer wavelength? UV or visible  visible  Which has a longer wavelength? Infrared or radio  Radio  Which has a higher frequency? Infrared or microwave  infrared  Which has a longer wavelength? UV or visible  visible  Which has a longer wavelength? Infrared or radio  Radio  Which has a higher frequency? Infrared or microwave  infrared

11 Using the Electromagnetic Spectrum  Which has a higher frequency? X-rays or cosmic waves  visible  Which has more energy? X-rays or gamma rays  Gamma rays  Which has more energy? radio or microwave  microwave  Which has a higher frequency? X-rays or cosmic waves  visible  Which has more energy? X-rays or gamma rays  Gamma rays  Which has more energy? radio or microwave  microwave

12 Electromagnetic Spectrum  Longitudinal waves Vibrate in same direction as lengtH

13 Electromagnetic Spectrum  Transverse waves Vibrate up and down at right angles to their length

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15 Electromagnetic Spectrum  Crest  Trough  Amplitude  Wavelength  Frequency  Crest  Trough  Amplitude  Wavelength  Frequency High point of a wave Low point of a wave Height from center of wave to high or Low point Distance between 2 crests or 2 troughs How many wave cycles pass by in a period of time

16 Electromagnetic Spectrum  Crest High point of a wave

17 Electromagnetic Spectrum  trough low point of a wave

18 Electromagnetic Spectrum  amplitude distance from the center of a wave to either a high point or a low point A A

19 Electromagnetic Spectrum  wavelength the distance between the crests or troughs of two waves that are next to each other

20 Electromagnetic Spectrum  Frequency how many wave cycles pass by in a period of time Freq= # cycles /time= ? SEC

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22 Labeling the parts of a wave  Look at the wave on your handout- label the parts as crests, troughs, amplitude or wavelength

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24 Wavelength Problems  Calculating wavelength, frequency and amplitude  Wavelength = the length between 2 peaks or valleys  Frequency = # cycles/ time (sec)  Amplitude= distance from middle to peak or valley  Look at the Side board for an example  Calculating wavelength, frequency and amplitude  Wavelength = the length between 2 peaks or valleys  Frequency = # cycles/ time (sec)  Amplitude= distance from middle to peak or valley  Look at the Side board for an example

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26 Wavelength & Electromagnetic Spectrum Websites  Website 1:Making WavesMaking Waves  Website 2: National Geographic: Wave Simulator--Volvo Oc...National Geographic: Wave Simulator--Volvo Oc...  Website 1:Making WavesMaking Waves  Website 2: National Geographic: Wave Simulator--Volvo Oc...National Geographic: Wave Simulator--Volvo Oc...

27 Wavelength Problems  Assessment: Handout  find the wavelength, amplitude and frequency of each wave on your handout  Assessment: Handout  find the wavelength, amplitude and frequency of each wave on your handout

28 Properties of Sound  Type of wave  Longitudinal waves

29 Properties of Sound  What is it caused by?  Vibrating air molecules

30 Properties of Sound  How is sound perceived?  Ear drum picks up vibrations in air

31 Properties of Sound  Through what types of mediums will it travel?  It travel through a solid, liquid, or gas (Fastest through solids)

32  Why can ’ t you hear someone shouting if you are on the moon?

33 Properties of Sound  In what direction does it travel?  In all directions (can bend around corners)

34 Properties of Sound  When does it bounce off a surface  Echoes created by hard surfaces

35 Properties of Sound  When is it taken in by a surface  Soft surfaces absorb sound

36 Soundproofing Rooms  Rooms are soundproofed by adding soft carpets, heavy curtains and soft tiles  “ Soft ” items take in or absorb sound

37 Properties of Sound  What is the speed at which it travels?  9. Travels at 335 m/sec

38 Sound Websites  Website 1: A Science Odyssey: You Try It: Radio Transmis...A Science Odyssey: You Try It: Radio Transmis...  Website 2: Interactive Sound Ruler--Flash version [NIDCD...Interactive Sound Ruler--Flash version [NIDCD...  Website 1: A Science Odyssey: You Try It: Radio Transmis...A Science Odyssey: You Try It: Radio Transmis...  Website 2: Interactive Sound Ruler--Flash version [NIDCD...Interactive Sound Ruler--Flash version [NIDCD...

39 Properties of Light  Type of wave  Transverse

40 Properties of Light  What is it caused by?  Waves of excited electrons

41 Properties of Light  How is it perceived or detected in humans?  By the eye

42 Properties of Light  Through what types of mediums will it travel  Doesn ’ t even need a medium (will travel through space)

43 Properties of Light  In what direction does it travel?  Straight lines

44 Properties of Light  When does it bounce off a surface?  Reflection

45 Properties of Light  When is it taken in by a surface  Abosorption

46 Properties of Light  What is the speed at which it travels?  300,000 km/sec

47 What Happens when Light Strikes Matter?  Absorption  Light taken in by matter

48 Properties of Light  Reflectio n  When light bounces off things:  Mirror  Color

49 Properties of Light  Transmittanc e  Light passes right through the matter it strikes

50 Properties of Light Transparent Light passes straight through –window, glass, air

51 Properties of Light  Translucent Light passes through and is scattered (wax paper, frosted glass)

52 Properties of Light  Opaque Light cannot pass through them (metal, wood)

53 Properties of Light  Refraction Bending of light as it passes through different mediums - Light goes slower through high density materials (causing bending)

54 Properties of Light  Refraction Examples less dense --> more dense = bends towards normal line

55 Properties of Light  Refraction Examples more dense--> less dense= bends away from normal line

56 Properties of Light  Refraction Examples Light moving head on between two substances w/ diff. Densities will not refract/bend

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58 Refraction

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61 Light Websites  Catch The Waves Catch The Waves  The Light Stuff The Light Stuff  Catch The Waves Catch The Waves  The Light Stuff The Light Stuff


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