How do you LIGHT Up your world ?Part I-Virginia SOL 5.3 ExaminingLight2004 with Hands-On Activities Compiled by, Marjorie Anne Wallace Elementary Science Resource Teacher 2002-2005 / NNPS & NSF Coop Agreement
Welcome to a power point presentation on LIGHT. • We will investigate the following: • 1. What is light? • 2.What are some sources of light around us? • 3. What are opaque, transparent, & translucent objects? • 4. What is a light wave? • 5.Are there any hands-on/minds-on activities I can do to learn more?
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 5.3 a-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) LIGHT Standards
Light • Our primary source of light is the sun. • Light travels in straight lines at a speed of 186,000miles per second. • *Light waves travel fasterthan 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.
Sensing Light • Humans have two light detectors. • Do you know what they are called?
How many sources of Light can you list and explain? • SUN=warms air, water, and land. • Fire=provides heat, light, and cooking fuel. • Lightning= • Firefly= • Flashlight= • Light bulb= • Laser beams= • Optical telephone fibers= *Trafficlights= *AIMS: Primarily Physics: Light Sources Activity
Can you answer these 5th grade 2003-SOL queries? • 1. A person will see a flash of lightning before they hear the thunder that goes with it because? *SOL 2003 querie #14/CORE 1 Exam (5.3e) • 2.Can you draw a long wavelength and a short wavelength next to it? *SOL2003 queire #9/CORE 1 Exam(5.3a) • 3.What scientific tools are used to study light? *SOL2003/CORE 2 Exam(5.3b) • 4. Can you contrast objects that are transparent, translucent, and opaque? *SOL2003/CORE 2 Exam(5.3d)
“Just Passing Through:” What happens when light strikes glass? Or waxed paper? Or a book? • If light travels through an object it is =transparent • If light is blocked by an object and a dark shadow is cast it is= opaque. • If some light passes through but not all and a light shadow is present it is=translucent. *AIMS:Primarily Physics: Just Passing Through Activity
What happens when light hits these objects? • Glass of water • School bus window • Notebook paper • Waxed paper • Plastic wrap • Tissue paper • Cardboard • Textbook • Hand lens…
Transparent objects: • The windows on a school bus, • A clear empty glass, • A clear window pane, • The lenses of some eyeglasses, • Clear plastic wrap, • The glass on a clock, • A hand lens, • Colored glass… • ALL of these are transparent. Yes, we can see through them because light passes through each of them.
Translucent objects • Thin tissue paper, • Waxed paper, • Tinted car windows, • Frosted glass, • Clouds, • All of these materials are translucent and allow some light to pass but the light cannot be clearly seen through.
Opaque objects: • Heavy weight paper, • Cardboard • Aluminum foil, • Mirror, bricks, buildings, • Your eyelids and hands, • Solid wood door, • All of these objects are opaque because light cannot pass through them at all. • They cast a dark shadow.
Let’s find out how light travels? • Simple Activity: 1 working flashlight • 1. Shine a flashlight on a wall. • 2. Does light from the flashlight reach the wall? How do you know? • 3. What evidence do you have showing light travels in a straight line? • 4.Record answers in your science journal • 5.Move closer with the flashlight. • Any changes? *Write a story about light.
Understanding Waves • The traditional hands-on/minds-on activities: • 1. “slinky lab: A Wave Simulation!” as well as • 2. “Waves in Action” (visual learner), and • 3. “Act It Out!Waves Tall and Small” (kinesthetic learner) activities will help children understand waves better. *Science Museum of Virginia: Light & Sound www.smv.mus.va.us • *Unitedstreaming movies:”Out of Darkness: An Introduction to Light: Facts About Light.”(auditory & visual learners). *Check with your building technology dept for your schools password.
What is light really?Electromagneticradiationwaves • 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
*Science Museum of VA A Wave Simulation Activity/Demo OR GEMS:”Invisible Universe” Comparing Wave Makers A wave simulation: • Materials: 1 long spring or rope • 1. Teacher and a strong student will hold either end of the coiled spring tightly braced against their body. • 2.Teacher will walk away from the student until the spring is loosely stretched between them. • 3.Gently snap the spring up and down once to send a wave of energy to the student’s hand. It will bounce back, or reflect, from the stationary end. • 4. Point out each wave has a crest (high half) and a trough (low half). Check for understanding
*Electromagnetic Radiation • Electromagnetic radiation can be described as a stream of photons. Each photon 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. Gamma-rays and cosmic rays have highest energy waves and are the deadliest. *Page info from NSTA Conference 2004
Don’t’ forget…longest waves (radio) ..to shortest waves (cosmic) *Page info from NSAT Conference 2004
Materials: 1. 9 volunteers 2. paper & pencil. These 2 activities help to explain the electromagnetic spectrum and dispel some of the common misconceptions. 1.Acting It Out! Waves Tall & Small Activity(The electromagnetic family) +2.Scaling the Spectrum Activity *Science Museum of Virginia Acting It Out! Activity + Scaling the Spectrum Activity OR GEMS: Invisible Universe Comparing Wave Makers I.