1.

The root mean square velocity of gas is doubled, which of the following is correct ?

Answer»

Its temperature is doubled
Its pressure is made four times
Its temperature is INCREASED four times
T is increased four times and pressure is doubled

Solution :C is correct because `U_("rms")=sqrt((3RT)/(m))`
If T is increase 4 times, `U_("rms")` will BECOME double.
`U_("rms")=sqrt((3P)/(d))`. If P is made four times .d. will became four times THEREFORE .u. remanic same. Hence B is not correct.
(D) is correct because if P will not affect density as EXPLAINED in (B) but `U_("rms") prop sqrt (T)`,
Hence `U_("rms")` becomes double.
Hence, (C ) and (D) are the correct answer.


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