1.

In an isotopic gas, with no preferred direction of motion of molecules,

Answer»

`upsilon_(x) = upsilon_(y) = upsilon_(Z)`
`upsilon_(x)^(2) = upsilon_(y)^(2) = upsilon_(z)^(2)`
`BAR(upsilon_(x)^(2)) = bar(upsilon_(y)^(2)) = bar(upsilon_(z)^(2))`
NONE of these

Solution :`bar(upsilon_(x)^(2)) = bar(upsilon_(y)^(2)) = bar(upsilon_(z)^(2))`


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