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Author Question: The half-life of 19N is 0.42 s. What is the decay constant for this isotope? a. 1.7 1011 Ci b. ... (Read 63 times)

dejastew

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on: Jul 28, 2018
The half-life of 19N is 0.42 s. What is the decay constant for this isotope?
 a. 1.7  1011 Ci
  b. 1.7 s1
  c. 1.1 s1
  d. The decay constant is not defined for a half-life of less than one second.

Question 2

The half-life of radioactive Technetium-99 is 6.0 hours. Find the number of 99Tc nuclei necessary to produce a sample of activity 18 Ci. (1 Ci = 3.7  1010 decays/second)
 a. 1.2  109
  c. 8.0  108
  b. 3.4  1011
  d. 2.1  1010


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moormoney

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Reply #1 on: Jul 28, 2018
Answer to Question 1

B

Answer to Question 2

D


dejastew

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Reply 2 on: Jul 28, 2018
Gracias!

ecabral0

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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