A) 4.2 years
B) 2.8 years
C) 5.6 years
D) 8.4 years
Correct Answer: B
Solution :
\[{{T}_{2}}={{T}_{1}}{{\left( \frac{{{R}_{2}}}{{{R}_{1}}} \right)}^{3/2}}=1\times {{(2)}^{3/2}}=2.8\,\,year\]
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