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Author Question: The sound from a single source can reach point O by two different paths. One path has a length 20.0 ... (Read 161 times)

imanialler

  • Hero Member
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  • Posts: 539
on: Jul 29, 2018
The sound from a single source can reach point O by two different paths. One path has a length 20.0 m and the second path has a length 21.0 m. The sound destructively interferes at point O.
 
  What is the minimum frequency of the source if the speed of sound is 340 m/s? A)
 
  340 Hz
 
  B)
 
  6800 Hz
 
  C)
 
  520 Hz
 
  D)
 
  680 Hz
 
  E)
 
  170 Hz

Question 2

A piece of plastic has a net charge of +2.00 C. How many more protons than electrons does this piece of plastic have?
 
  A)
 
  1.25  1013
  B)
 
  1.25  1019
  C)
 
  2.50  1013
  D)
 
  2.50  1019
  E)
 
  0


zhanghao

  • Sr. Member
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  • Posts: 316
Reply #1 on: Jul 29, 2018
Answer to Question 1

E

Answer to Question 2

A


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