6th grade ch. 2 sec. 1 energy in the atmosphere
TRANSCRIPT
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Ch. 2 Sec. 1
Energy in the Atmosphere
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electromagnetic waves• form of energy that can travel thru.
vacuum of space
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radiation• direct transfer of energy by
electromagnetic waves
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visible lightMade of colors in
the rainbow:
RedOrangeYellowYellowGreenBlue
Indigo Violet
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ultraviolet radiation• wavelengths - shorter than visible
light
• causes:
1. skin cancer
2. eye damage
3. sunburns
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infrared radiation• wavelengths- longer than red light
• not visible
• felt as heat
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What happens to sunlight in the atmosphere?
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•reflection of light in all directions
scattering
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greenhouse effect •process by which gases hold heat in air
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Greenhouses are structures designed to retain heat.
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Discover Activity -Does a Plastic Bag Trap Heat?
1. Record the initial temperatures on two thermometers. (You should get the same readings.)
2. Place one of the thermometers in a plastic bag. Put a small piece of paper in the bag so that it shades the bulb of the thermometer. Seal the bag.
3. Place both thermometers on a sunny window ledge or near a light bulb. Cover the bulb of the second thermometer with a small piece of paper. Predict what you think will happen.
4. Wait five minutes. Then record the temperatures on the two thermometers.
• Think It Over• Measuring Were the two temperatures the same? How
could you explain any difference?