A) \[1:1.4\]
B) \[1:1\]
C) \[1.4:1\]
D) \[1:2\]
Correct Answer: C
Solution :
\[\because \] \[\frac{{{r}_{H}}}{{{r}_{He}}}=\sqrt{\frac{{{M}_{He}}}{{{M}_{H}}}}\] \[=\sqrt{\frac{4}{2}}=\sqrt{2}=1.4\] \[\therefore \] \[{{r}_{H}}:{{r}_{He}}=1.4:1\]
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