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Author Question: Sunspot numbers were lowest in this century: A) seventeenth century. B) eighteenth century. C) ... (Read 170 times)

olgavictoria

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on: Jul 14, 2018
Sunspot numbers were lowest in this century:
 
  A) seventeenth century.
  B) eighteenth century.
  C) nineteenth century.
  D) twentieth century.

Question 2

Explain why ultraviolet (UV) radiation causes sunburn and infrared (IR) radiation does not.
 
  What will be an ideal response?


katara

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Reply #1 on: Jul 14, 2018
Answer to Question 1

Answer: A

Answer to Question 2

Answer: The amount of energy delivered is determined by wavelength; shorter wavelengths are more energetic. Ultraviolet radiation is associated with shorter wavelengths and can deliver more energy to exposed skin than can infrared radiation.


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