Question:
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The escape velocities of planet $A$ and $B$ are same. But $A$ and $B$ are of unequal mass.
Reason $R$ : The product of their mass and radius must be same, $\mathrm{M}_{1} \mathrm{R}_{1}=\mathrm{M}_{2} \mathrm{R}_{2}$
In the light of the above statements, choose the most appropriate answer from the options given below:
Correct Option: , 2
Solution:
$\mathrm{V}_{\mathrm{e}}=\sqrt{\frac{2 \mathrm{GM}}{\mathrm{R}}}$
$\frac{\mathrm{M}_{1}}{\mathrm{R}_{1}}=\frac{\mathrm{M}_{2}}{\mathrm{R}_{2}}$
$\mathrm{M}_{1} \mathrm{R}_{2}=\mathrm{M}_{2} \mathrm{R}_{1}$
Hence reason $R$ is not correct.