Name:_____________________________________________________

1. By what process does the Sun provide energy to Earth?
   
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2. What types of energy does the Sun provide?
   
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3. The electromagnetic spectrum is divided on the basis of
   
   ____________________________________________________________________________________.



4. Infrared rays are    longer    or    shorter    (circle one)    than visible rays.



5. In the visible light spectrum, green has    longer    or    shorter    (circle one)    wavelengths than orange.



6. What do ultraviolet rays cause?    ____________________________________________________



7. When radiation is absorbed by an object, its temperature    increases    or    decreases    (circle one).



8. What are two basic laws of radiation?
   
   
   1. ___________________________________________________________________________________________
   
   
   
   2. ___________________________________________________________________________________________
   
   
   



9. Why does metal change color as it is removed from fire?
   
   ____________________________________________________________________________________________________
   
   
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10. After metal returns to its original color but is still warm, what type of radiation does it emit?
    
    _______________________________________________________________________________



11. What type of energy does the Sun emit?
    
    ________________________________________________________________________________



12. What type of energy does Earth emit?
    
    ________________________________________________________________________________



13. Gases in the atmosphere are transparent to what type of radiation?
    
    ________________________________________________________________________________



14. What type of radiation is easily absorbed by the atmosphere?
    
    ________________________________________________________________________________



15. Gases are  ____________________________  absorbers and radiators.