First slide
Kinetic theory of ideal gases

The average translational energy and the rms speed of molecules of a sample of oxygen gas at 300 K are 6.21×1021J and 484 ms-1 respectively. The corresponding values at 600 K are nearly (assuming ideal gas behaviour)


ET and vrmsT. Hence at 600 K,

E2E1=T2T1E=6.21×1021×600300 =12.42×1021Jand v2v1=T2T1 vrms=484×600300684ms1

which is choice (d).

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