The average translational energy and the...

The average translational energy and the rms speed of molecules in a sample of oxygen gas at `300K` are `6.21xx10^(-21)J` and `484m//s`, respectively. The corresponding values at `600K` are nearly (assuming ideal gas behaviour)

A

`12.42xx10^-21` J, 968 `ms^-1`

B

`8.78xx10^-21` J, 648 `ms^-1`

C

`6.21xx10^-21` J, 968 `ms^-1`

D

`12.42xx10^-21` J, 684 `ms^-1`

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