Atoms And Nuclei Question 394

Question: A sample of radioactive substance has 106 nuclei. If half-life is 20 seconds, the number of nuclei left in the sample after 10 second is

Options:

A) 104

B) 2×105

C) 7×105

D) 11×105

Show Answer

Answer:

Correct Answer: C

Solution:

  • N=N0eλ/t=106e[In220×10] =106eIn2=1062=≈7.07×105


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