At what temperature of oxygen molecules have the same rms velocity as helium molecules at N.T.P.? (Molecular wt. of oxygen is 32 and that of helium is
At what temperature of oxygen molecules have the same rms velocity as helium molecules at N.T.P.? (Molecular wt. of oxygen is 32 and that of helium is 4).
A. `1900^(@)C`
B. `1911^(@)C`
C. `1950^(@)C`
D. `1970^(@)C `
4 views
1 Answers
Correct Answer - B
`(C_(2))/(C_(1))=sqrt((M_(1))/(M_(2))xx(T_(2))/(T_(1)))`
`1=(M_(1))/(M_(2))xx(T_(2))/(T_(1))`
`therefore T_(2)=(M_(2))/(M_(1))xxT`
`=(32)/(4)xx273`
`T=8xx273=2184`
`t=2184-273=1911^(@)C`
4 views
Answered