The correct answer is 2V_rms.
The molecules are interacting with the container walls as well as one another as they move through it at varying speeds and directions. As a result, even at the same temperature, each particle's velocity and, consequently, kinetic energy, are constantly changing.
The value of the square root of the sum of the squares of the stacking velocity values divided by the quantity of values is the root-mean square (RMS) velocity. The RMS velocity is the speed of a wave traveling along a certain ray path across subsurface strata with various interval velocities.
According to the formula
V_rms = √3RT/M
T"=4T
Then, V'_rms = √(3R×4T)/M
V'_rms=2√(3RT/M)
V'_rms=2V_rms
To learn more about root-mean square (RMS) refer the link:
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