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Author Question: A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to ... (Read 91 times)

MirandaLo

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on: Jul 29, 2018
A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 Ci? 1 Ci = 3.7  Bq.
 
  A) 5.8  109
  B) 8.5  108
  C) 6.3  108
  D) 3.2  109
  E) 2.4  109

Question 2

The carbon in your body was formed in nuclear reactions in long-dead stars. How much energy was released when three 4He nuclei combined to make 12C? The mass of 4He is 4.002603 u, the mass of 12C is 12.0000 u, and 1 u = 931.494 MeV/c2.
 
  A) 7.274 MeV
  B) 3716 MeV
  C) 8.424 MeV
  D) 2.106 MeV


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okolip

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

Answer: A

Answer to Question 2

Answer: A


MirandaLo

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Reply 2 on: Jul 29, 2018
Gracias!

xiaomengxian

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Reply 3 on: Yesterday
Wow, this really help

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