1. The Greenhouse Effect
By: Tala Barcena

2. Radiation (electromagnetic radiation)
What is the greenhouse effect? Has it always been present in our atmosphere?
Radiation (electromagnetic radiation)
Visible light, Infrared radiation, Ultraviolet rays
Short -wave solar radiation
Long wave radiation (terrestrial radiation)
Absorption and Reradiation
What are the greenhouse gasses? How do they help regulate global temperatures? What are the sources for these gasses?
What happens when matter absorbs light?
Reflection
Absorption
From incident light to kinetic energy to thermal energy
Is it good or bad?
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3. What is the greenhouse effect?
Has it always been present in our atmosphere?
astrocampschool.org

4. Electromagnetic radiation
EM or EMR
Form of energy
Broad range
Electromagnetic Theory
EM spectrum
Waves and Fields

5. Electromagnetic Theory
James Clerk Maxwell
4 main interactions
- The force of attraction...
- Magnetic Poles...
- An electric current...
- A moving electric field
Maxwell’s equations
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6. The EM Spectrum Seven regions Decreasing wavelengths-Increasing energy
Enormous range

7. Waves and Fields meters (m) or fractions thereof Frequency
- number of waves
- cycles per second
- hertz (Hz)
Short wavelength
- higher frequency
Longer wavelength
- lower frequency

9. Visible light form of EM radiation found in the middle
400 THz to 800 THz (frequency)
740 nm to 380 nm (wavelength)
Colour
- objects don’t ‘have’ colour

10. Infrared radiation household appliances use IR invisible to human eyes
above about 5 degrees Kelvin
30 THz to 400 THz (frequency)
100 μm to 740 nm (wavelength)
Incandescent bulbs
- 10% into visible light energy
- 90% converted to IR

12. Ultraviolet rays Type of EM radiation Comes from the sun
Damages living tissues
8 × 1014 to 3 × Hz (frequency)
380 nm to about 10 nm
3 sub-bands;
- near UV ( nm)
- middle UV ( nm)
- far UV ( nm)

13. (terrestrial radiation)
Short-wave solar radiation
Long-wave radiation
(terrestrial radiation)
Visible light and Ultraviolet radiation
Infrared radiation (IR)
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14. How do they help regulate global temperatures?
What are the sources for these gases?
What are the greenhouse gases?

15. What happens when matter absorbs light?

16. Reflection

17. Absorption

18. From incident light to kinetic energy to thermal energy

19. Is it good or bad?

20. References: Images: Video:
Images:
Video: