Atoms And Nuclei Question 389

Question: A radioactive substance with decay constant of 0.5s1 is being produced at a constant rate of 50 nuclei per second. If there are no nuclei present initially, the time (in second) after which 25 nuclei will be present is

Options:

A) 1

B) In 2

C) In (4/3)

D) 2 to (4/3)

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Answer:

Correct Answer: D

Solution:

  • dNdt=50N0.5,0NdN502N=0tdt N=(100(1et/2))=25 t=2 In (4/3)


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