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Author Question: The material used in certain nuclear bombs is 239Pu, which has a half-life of about 20,000 years. ... (Read 75 times)

123654777

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on: Jul 29, 2018
The material used in certain nuclear bombs is 239Pu, which has a half-life of about 20,000 years. How long must we wait for a buried stockpile of this substance to decay to 4.0 of its original 239Pu mass?
 
  A) 93,000 y
  B) 64,000 y
  C) 45,000 y
  D) 800 y

Question 2

What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? (1 u = 1.6605  10-27 kg)
 
  A) 1.70  10-12 kg
  B) 5.38  10-19 kg
  C) 3.84  10-20 kg
  D) 8.68  10-13 kg


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tanna.moeller

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

Answer: A

Answer to Question 2

Answer: A


123654777

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Reply 2 on: Jul 29, 2018
Great answer, keep it coming :)

scottmt

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Reply 3 on: Yesterday
Wow, this really help

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