Created by: Kristal Pride
Saddleback Valley Unified School District
URL: http://www.can-do.com/uci/lessons99/light.html
URL: http://www-sci.lib.uci.edu/SEP/CTS99/light.html |
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Background Info.:
Electromagnetic energy comes in different forms because of the varying
wavelengths
of each wave. Some of these waves we can see, some we can feel, and
others can be extremely harmful. Below is a chart of electromagnetic
energy and its various forms.
ELECTROMAGNETIC ENERGY
| Cosmic rays |
Background radiation; particles of enormous
energy given off by stars. |
| Gamma radiation |
Deadly high energy given out by the sun and other stars. |
| X rays |
High energy used in X ray equipment. |
| Ultraviolet rays |
Invisible energy waves in sunlight, which cause skin
to tan. |
| Visible light |
Basic colors of light, emitted by the sun and visible to the
human eye. ROYGBIV. |
| Infrared rays |
Rays of heat energy; sensed by our nervous system. |
| Radio waves |
Microwaves; TV; radio energy |
Materials:
1. Computer with internet
access
2. Activity sheet
Procedure:
Use your activity sheet to record the answers to the questions. When
traveling to a hyper link site make sure to READ ALL INSTRUCTIONS BEFORE
CLICKING.
PART A: POINTS TO PONDER.
By the end of the lesson you should be
able to answer the following questions. Record your answers on the
activity sheet. You will need to work through the entire lesson before
being able to answer each question completely.
1. Why do we see a blue
sky?
2. Why do we see white
clouds?
3. Why do we see red,
orange, and/or yellow sunsets? |
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PART B: DEFINITIONS
AND DRAWINGS.
Use the hyper links to find definitions
for each of the words below. Provide an illustration for each term.
Sometimes the definitions will not be clear and you will need to interpret
what you read to get a definition. Record your answers on your activity
sheet.
There
are other links associated with each of the ones above. Make sure
and visit some of them and read them. You may find the answers to
the questions from part A.
PART C: REFRACTION
DEMONSTRATION.
Visit the following link to experiment
with refraction.
If possible, try every combination to gain a better understanding.
Draw a picture and include the details of at least 1 of your experiments.
PART D: VISION.
As you have learned, light
travels in waves. When those waves enter our eyes we see objects
and color. We recognize the color of an object from the color that
is reflected. For example, we see that a flower is red because it
reflects red light. For some people however, the component of the
eye that recognizes color (cones) are either not present or they do not
function correctly. Go to the link color
blind and follow the directions on color recognition.
PART E: EXTRAS.
Investigate the light
debate and decide which side of the argument you think has the most
supported information.
Visit Newton's
Apple and participate in some of the activities.
Learn more about how some of the shortest waves in the
electromagnetic spectrum heat your food at microwaves.
