|Earth and Space Science||The Solar System 6K1.00||Process Of Science||Explaining 1.5 a|
Sponsored by the National Science Foundation
CONTENT STANDARD: Earth and Space Science
CONTENT TOPIC: The Solar System
CONCEPT: The sun's energy arrives as light with a range of wavelengths.
CONTENT OBJECTIVE: 6K1.00 To understand what makes up light and how it relates to your life.
INSTRUCTIONAL OBJECTIVES: The learner will:
TN COMPONENT OF SCIENCE: Process of Science
BENCHMARK: The graphic display of numbers may help to show patterns such as trends, varying rates of change, gaps, or clusters.
Light is a form of energy that you can see and is always moving.
2. Behavior or characteristics
A. Light travels from the sun to earth by electromagnetic waves.
B. Wavelength can be described in 2 ways: The distance between the crest of one wave and the crest of the next; or the distance from one trough to the next.
C. Frequency is the number of waves that pass by at a point each second. Different light waves have different frequencies. The shorter the wavelength of a wave, the greater its frequency.
D. Intensity is the brightness of light. It depends on the amount of light from the source. For example, a 60-watt bulb produces more light than a 25-watt bulb. It depends on the distance from the light source. As light travels away from the source, it spreads out over a larger area. As a result, the intensity of light decreases as the distance from a source increases.
The sun is a major source of energy for changes on the Earth's surface. The sun's energy arrives as light with a range of wavelengths, consisting mainly of visible light with significant amounts of infrared (heat) and ultraviolet radiation. Visible light is also called white light. White light can be separated into colors by passing it through a prism. A prism is a triangular piece of glass, quartz or plastic that separates white light into a band of colors (spectrum) by bending it.
1. Hold the radiometer in the sunlight to demonstrate how light is a form of radiant energy.
2. Investigating the color of light. Using a spectroscope or diffraction grating, look at an incandescent bulb. Then, look at a florescent light. (Ask students to tell how they are alike and how they are different.) Next, hold a clear bulb (3 or 4 in.) away and use the diffraction grating to observe the light again. (Tell the students to describe what they see.)
How did the radiometer prove that light is a form of radiant energy?
The entire system of all waves is the electromagnetic spectrum. Spectrum means band. You observe waves when you throw a rock in still water. The waves move (radiate) out and away. Energy works in the same way. Radiation simply means the sending out of energy waves. A light bulb radiates light. A radio station radiates radio waves. A boiling pot of water radiates heat. An X-ray source radiates X-rays.
(Starting with the longest wave- the radio wave- make a chart showing the electromagnetic spectrum on the board. Radio wave, microwave, infrared wave, visible light, ultraviolet wave, X-ray, and gamma ray.)
( Ask students to predict which will be the same for each group.)
Could these models represent houses?
|unpainted can||time min.||0||5||10||15||20||25||30||35|
2. Graph the temp. changes of each can by placing time on the horizontal axis and temp. on the vertical axis. Graph each set of data on the graph using 2 different colors. Draw each curve.
Which color roof would absorb the most energy? Explain.
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