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Author Question: Suppose that the speed of an electron traveling 2000 m/s is known to an accuracy of 1 part in 105 ... (Read 75 times)

Anajune7

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on: Jul 29, 2018
Suppose that the speed of an electron traveling 2000 m/s is known to an accuracy of 1 part in 105 (i.e., within 0.001). What is the greatest possible accuracy within which we can determine the position of this electron?
 
  A)
 
  2.9 mm
  B)
 
  5.8 mm
  C)
 
  8.7 mm
  D)
 
  1.2 cm
  E)
 
  1.6 cm

Question 2

It can be shown that the approximate age of the universe is 1/H, where H is the Hubble constant. Taking H = 20 km/s/Mly, estimate the age of the universe, in years.
 
  A)
 
  1500 years
  B)
 
  15 thousand years
  C)
 
  15 million years
  D)
 
  15 billion years
  E)
 
  15 trillion years


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angrybirds13579

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Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

D


Anajune7

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Reply #2 on: Jul 29, 2018
Both answers were spot on, thank you once again


angrybirds13579

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Reply #3 on: Jul 29, 2018
Great! Please up vote :D


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