A) \[2.275\times {{10}^{3}}yr\]
B) \[3.735\times {{10}^{2}}yr\]
C) \[1.62\times {{10}^{3}}yr\]
D) \[7.28\times {{10}^{2}}yr\]
Correct Answer: A
Solution :
Key Idea: Average life\[=1.44\times half-life\] Given, half-life \[=1580\,yr\] \[\therefore \]Average life \[=1.44\,\times \,1580\] \[=2275\,yr\] \[=2.275\,\times {{10}^{3}}\,yr\]
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