The average energy of molecules in a sample of oxygen gas at 300K are `6.2 J xx 10^(-21)` J. The corresponding values at 600K are

Options

A. `12.12xx10^(-21)J`
B. `8.78xx10^(-21)J`
C. `6.21xx10^(-21)J`
D. `12.42xx10^(-21)J`

Answer

D

Explanation

The average energy of the molecule is E`=3/2KT`
`(E_(2))/(E_(1))=(T_(2))/(T_(1))=600/300=2`
`E_(2)=2E_(1)=2xx3/2KT`
`=3xx1.38xx10^(-23)xx300`
`=12.42xx10^(-21)J`
So correct choice is (d).