Question

20. Mean square velocity of five molecules of velocities 2 m/s, 3 m/s, 4 m/s, 5 m/s and 6 m/s is..
(A) 10m/s
(B) 18m/s
(C) 20m/s
(D) 15m/s​

Answer 1

Answer:

(d) 18 m/s

Explanation:

V1 = 2m /s

V2 = 3m / s

V3 =4m / s

V4 = 5m / s

V5 = 6m / s

= V mean = v 1 + v 2 + v 3 + v 4 + v 5

= V mean = (2)^2 +(3^)2 +(4)^2 +(5)^2+( 6)^2 / 5

= V mean = 4 + 9 + 16 + 25 + 36 / 5

= 90 / 5

= 18