A) 2
B) 4
C) 8
D) 16
Correct Answer: A
Solution :
\[\frac{{{r}_{g}}}{{{r}_{He}}}=\sqrt{\frac{{{M}_{He}}}{{{M}_{g}}}}\therefore {{M}_{g}}={{M}_{He}}.\frac{{{r}^{2}}_{He}}{{{r}^{2}}_{g}}=\frac{4}{{{(1.4)}^{2}}}=\frac{4}{1.96}=2\] \[\left[ Note:1.4=\sqrt{2} \right]\]
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