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. `12.42 xx 10^(-21) J,968 ms^(-1)`
B. `8.78 xx10^(-21) J, 684 ms^(-1)`
C. `6.21 xx 10^(-21) J, 968 ms^(-1)`
D. `12.42 xx 10 ^(-21) J, 684 ms ^(-1)`
