Cloud chambers have been replaced by bubble chambers because ...

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Cloud chambers have been replaced by bubble chambers because
 
  A)
 
  the radioactive clouds were too dangerous to work with.
  B)
 
  the density of fluids is greater than the density of vapors.
  C)
 
  bubble chambers tend to be larger and more expensive.
  D)
 
  gamma rays are visible in bubble chambers, but not in cloud chambers.

Question 2

If two uncharged objects are rubbed together and one of them acquires a positive charge then the other one
 
  A)
 
  remains the same.
  B)
 
  also acquires a positive charge.
  C)
 
  acquires a negative charge.
  D)
 
  may or may not acquire a positive charge.
  E)
 
  may or may not acquire a negative charge.

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Answer to Question 1

B

Answer to Question 2

C

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Both answers were spot on, thank you once again

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Great! Please up vote