A) \[3.80\times {{10}^{8}}\,metres\]
B) \[3.37\times {{10}^{6}}\,metres\]
C) \[7.60\times {{10}^{4}}\,metres\]
D) \[1.90\times {{10}^{2}}\,metres\]
Correct Answer: A
Solution :
\[U=-\frac{GMm}{r}\] \[\Rightarrow \,7.79\times {{10}^{28}}\]\[=\frac{6.67\times {{10}^{-11}}\times 7.4\times {{10}^{22}}\times 6\times {{10}^{24}}}{r}\] \[\Rightarrow \,\,r=3.8\times {{10}^{8}}\,m\]
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