A certain crying baby emits sound with an intensity of 8.0 10-8 ...

[penguins]

A certain crying baby emits sound with an intensity of 8.0  10-8 W/m2.
 
  What is the intensity level due to a set of five such crying babies, all crying with the same intensity? You can neglect any absorption, reflection, or interference of the sound. The lowest detectable intensity is 1.0  10-12 W/m2. A) 79 dB
  B) 69 dB
  C) 56 dB
  D) 49 dB
  E) 36 dB

Question 2

Radon is
 
  A) the chemically active element in asbestos.
  B) a type of electromagnetic radiation that is produced by the sun and partially penetrates Earth's atmosphere.
  C) the main component in the radioactive fallout from nuclear weapons and nuclear power plant accidents.
  D) a radioactive gas produced by the rocks and soil that can filter into houses.
  E) the radioactive substance that will probably be used to irradiate and sterilize food.

[peilian]

Answer to Question 1

C

Answer to Question 2

D

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