Atoms And Nuclei Question 370

Question: If a radioactive material contains 0.1 mg of Th234 how much of it will remain unchanged after 120 days. Given Half-life is 24 days

Options:

A) 1.12μg

B) 0.1μg

C) 3.125μg

D) 125μg.

Show Answer

Answer:

Correct Answer: C

Solution:

  • Using MM0=(12)t/T=(12)120/24=(12)5=132 So M=M032=0.1mg32=3.125,μg.


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