Six molecules speed 2 unit , 5 unit , 3unit, 6 unit, 3 unit , and 5unit , respectively . The rms speed is

Options

A. 4 unit
B. 1.7 unit
C. 4.2 unit
D. 5 unit

Answer

C

Explanation

We have , `v_("rms")=sqrt((V_(1)^(2)+V_(2)^(2)+....+V_(n)^(2))/(n))`
`=sqrt((4+25+9+36+9+25)/(6))`
`sqrt((108)/(6))=sqrt(18)=3sqrt(2)=3xx1.414=4.242 ` unit