Two in phase coherent sources emitting harmonic waves of ...

[oliviahorn72]

Two in phase coherent sources emitting harmonic waves of wavelength  are separated by a distance d.
 
  What is the minimum non-zero value of d for which constructive interference occurs everywhere along the line that passes through the locations of the two sources? A)
 
  /4
 
  B)
 
   
 
  C)
 
  2
 
  D)
 
  /2
 
  E)
 
  4

Question 2

If an all electric house uses 2400 kWh in a month, what will the amount of the bill for electricity be at a rate of 9.5 cents per kWh?
 
  A)
 
  23
  B)
 
  2280
  C)
 
  228
  D)
 
  25,300
  E)
 
  11.50

[Heffejeff]

Answer to Question 1

B

Answer to Question 2

C

[oliviahorn72]

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[Heffejeff]

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