Question
Atomic radius of fcc is

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$A.$ The $r.m.s$. velocity of gas molecules in two vessels will be the same.
$B.$ The ratio of pressure in these vessels will be $1: 4$
$C.$ The ratio of pressure will be $1: 1$
$D.$ The $r.m.s.$ velocity of gas molecules in two vessels will be in the ratio of $1: 4$