Question

The root mean square speed of smoke particles of mass 5 x 10^–17 kg in their Brownian motion in air at NTP is approximately. 

[Given k = 1.38 x 10^–23 JK–1 ]

(A) 60 mm s^–1 

(B) 12 mm s^–1 

(C) 15 mm s^–1 

(D) 36 mm s^–1

Answer 1

Correct option is (C) 15 mm s^–1