Presentation is loading. Please wait.

Presentation is loading. Please wait.

How do you LIGHT Up your world ? Virginia SOL 5.3

Similar presentations

Presentation on theme: "How do you LIGHT Up your world ? Virginia SOL 5.3"— Presentation transcript:

1 How do you LIGHT Up your world ? Virginia SOL 5.3
Part II-Examining Light with Hands-On Activities Compiled by, Marjorie Anne Wallace Elementary Science Resource Teacher , NNPS & NSF Coop Agreement

2 Welcome to a power point presentation on LIGHT.
We will investigate the following: 1. What is light? 2. What makes up the visible spectrum? 3.How does a prism work? 4.Are there any hands-on/minds-on activities I can do to learn more?

3 LIGHT Standards Virginia Standards of Learning 5.3a-e:
National Science Education Standards Physical Science: Content Standard B As a result of the activities in grades K-4, all students should develop an understanding of light, heat, electricity, and magnetism. Virginia Standards of Learning 5.3a-e: The student will investigate and understand basic characteristics of visible light and how it behaves. (*Key concepts, 5.3a-e, are listed in your teacher curriculum guide)

4 A light review: Our primary source of light is the sun.
Light travels in straight lines at a speed of 186,000miles per second. Light waves travel faster than sound waves. Light energy from the sun travels through space , reaches earth, and some of it turns to heat energy and warms the earth’s air. Light from the sun also travels to the cells of green plants (producers) and is stored as energy. When light reaches an object, it is absorbed, reflected, or passes through it.

5 Sensing Light Humans have two light detectors.
Do you know what they are called? Did you realize cameras and camcorders are light detectors too?

6 SOL query 5th grade 2003 Released Test Item#31 / CORE 1
#31 By passing white light through a prism, you can tell- A that white light is actually a mixture of different colors B the mass of the prism C the original source of the light D that blue light is brighter than white light

7 What is light really? Electromagnetic radiation waves
Light waves are three dimensional Light waves vibrate in all planes around a center line. The waves have high points called “crests.” Waves also have low points called “troughs.” *The distance from one crest to the next crest is called a “wavelength.” *The number of waves passing a given point in one second is called the “frequency.” wavelength *A Science Museum of VA: Light Science Activity

8 *Electromagnetic Radiation
Electromagnetic radiation can be described in terms of a stream of photons. Each photon is traveling in a wave-like pattern, moving at the speed of light and carrying some amount of energy. The only difference amongst radio waves, visible light, and gamma-rays is the amount of energy of the photons. Radio waves have photons with low energies. Microwaves have a little more energy than radio waves. Infrared has still more energy. As we move down the chart we see visible, ultraviolet, X-rays, and gamma-rays whose photon energies gradually increase. Gamma and Cosmic rays have the highest energy waves. *Slide info from NSTA 2004 conference

9 Remember radio waves are long…and gamma rays are small
Radio-TV -Microwave- Infrared - VISIBLE -Ultraviolet -X-rays - Gamma- Cosmic

10 Radio (Longest electromagnetic waves)
Emitted by Astronomical Objects Radio Station Transmitters Detected by Ground based radio telescopes *If you turn on a radio,, it will convert the radio wave energy into sound energy.

11 Television Shorter than radio, also used to carry messages (pictures & sound) to our TV sets. *We can sense the TV waves around us with our televisions.

12 Microwave Emitted by: Detected by Gas clouds collapsing into stars
Microwave Ovens Radar Stations Cell Phones Detected by Microwave Telescopes Food (heated) Cell phones Radar (systems)

13 Infrared (Heat or Thermal) Are you a source of infrared? YES you are!
Emitted by Sun and stars (Near) TV Remote Controls Food Warming Lights (Thermal) *Everything at room temperature or above,=HEAT Detected by Infrared Cameras TVs, VCRs, Your skin

14 Let’s take a look at Herschel’s Experiment
Discovered Invisible Light In 1800, Herschel places his control thermometer just outside the red end of the spectrum Result: The outside thermometer registered the highest temperature

15 Let’s set up Herschel’s Experiment
Set up of Box Design for Conducting the Herschel Experiment.

16 Conducting Hershel’s Experiment
Place a sheet of white paper inside a cardboard box Tape three thermometers together and place inside box Cut a small notch in the top of the box and position a glass prism so that the spectrum is projected inside the box Arrange the thermometers so that one is just outside the red end of the spectrum, with no visible light falling on it

17 Visible Each color is a different size wave
Visible Each color is a different size wave. Red the longest & violet the shortest Emitted by The sun and other astronomical objects Laser pointers Light bulbs Detected by Cameras (film or digital) Human eyes Plants (red light) Telescopes RoyG.Biv

18 Prism Power: Roy G. Biv Activity
*PASCO Probe Activity OR *AIMS:Primarily Physics: Prism Power Activity *What happens when light shines through prisms? Materials :prism, PASCO “wave it,”equipment, paper, +7 Roy G. Biv crayon colors, 1. Give handouts. Darken the room and turn on light source. What color is the light? If I use a prism can you predict what will happen to the light? 2.Now use the prism. What color is the light? 3. Color in your hand out to match the spectrum.

19 Ultraviolet Sunburn / black light
He can get skin cancer! Emitted by Tanning booths (A) The sun (A) Black light bulbs (B) UV lamps Detected by Space based UV detectors UV Cameras Flying insects (flies)

20 X-ray Emitted by Detected by Astronomical objects X-ray machines
CAT scan machines Older televisions Radioactive minerals Airport luggage scanners Detected by Space based X-ray detectors X-ray film CCD detectors

21 Chandra X-ray Observatory
Chandra is designed to observe X-rays from high energy regions of the universe, such as the remnants of exploded stars. The most sophisticated observatory built to date. Deployed by the Space Shuttle Columbia on July 23, 1999, Chandra X-ray Observatory *Slide from 2004 NSTA Conference

22 Gamma Ray (Short electromagnetic waves but more energetic)
Emitted by Radioactive materials Exploding nuclear weapons Gamma-ray bursts Solar flares Detected by --Geiger counters Gamma detectors and astronomical satellites Medical imaging detectors

23 Sources of g-ray Emission
• Black holes • Active Galaxies • Pulsars • Diffuse emission • Supernovae Gamma-ray bursts • Unidentified

24 COSMIC Rays (The highest energy waves and the deadliest)
Cosmic rays come from deep space and can pass through the Earth.

25 How big are the waves? A great question! Radio waves= (Buildings to
human size); Microwaves (Humans-beetles); Infrared waves (Eye of a needle); Visible waves (microscopic size)! WOW! All the rest are the size of molecules, atoms, atomic nuclei and smaller..

26 Part III looks at: reflection and refraction of LIGHT.
Part I examines: what is light? Waves, opaque, transparent, & translucent, & sources of light around us. Special thanks to NSTA Conference workshops on light!

Download ppt "How do you LIGHT Up your world ? Virginia SOL 5.3"

Similar presentations

Ads by Google