Warm-up Mon. 4/30/07

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Warm-up Mon. 4/30/07

1. Why were early humans not afraid of dinosaurs?
2. What is relative dating? What does it tell us?
   (hint not something you do at family reunions)
3. What is the difference between an asteroid and a
   nebula?

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Solar Radiation!
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Heat vs. Tempo

• Tempo
• Measure of the average kinetic energy of
  molecules in an object
• (Energy of motion)
• Heat
• Energy transferred from one object to another due
  to differences in Tempo

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3 Ways to transfer Heat Energy

• Conduction
• Heat through molecules
• Convection
• Circulation of substance
• Fluids (air/water)
• Radiation
• Energy stored in waves
• No material!
• Electromagnetic
• waves

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Radiation

• Electromagnetic Waves
• Different wavelengths

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Which kind of heat transfer?
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Which do you think is most important in heating
up atmosphere?
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Radiation!

• 4 laws!
• All objects emit waves
• Hotter more radiation
• Hotter short wavelengths
• Good absorbers Good Emitters

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What happens to Solar Radiation?

• Absorbed by objects
• Get hot!
• Goes through transmit
• Bounces off!
• Reflection
• Refraction
• Photosynthesis

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Greenhouse Effect

1. Radiation
2. Absorption
3. Reflection
4. Repeat

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What do you think this photo shows?
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Radiation Can Lab (40pts)

• Materials
• 2 cans or 2 beakers
• Heat lamp
• Stop watch
• Worksheet
• Radiation Poster! (20pts)
• Absorb
• Reflect
• Transmit
• Photosynthesis

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