A) \[4.5\times {{10}^{9}}yr\]
B) \[9.0\times {{10}^{9}}yr\]
C) \[13.5\times {{10}^{9}}yr\]
D) \[2.25\times {{10}^{9}}yr\]
Correct Answer: A
Solution :
Equal no. of atoms of U and Pb means half of U has disintegrated. \[\therefore \]Time taken\[={{t}_{1/2}}=4.5\times {{10}^{9}}yr\]You need to login to perform this action.
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