Question

Which of the following relation is correct in between average velocity and rms velocity?

• A. 0.8 $C_{rms}$
• B. 0.981 $C_{rms}$
• C. 0.9213 $C_{rms}$
• D. 0.7567 $C_{rms}$

Answer 1

Answer: (C)

0.9213 $C_{rms}$

The relationship among velocities are:

$C_{av}$ : $C_{rms}$ $=\sqrt{\frac{8RT}{\Pi M}}$ : $\sqrt{\frac{3RT}{M}}$

$C_{av}$ : $C_{rms}$ $=\sqrt{\frac{8}{\pi }}$ : $\sqrt{3}$

$C_{av}$ : $C_{rms}$ $=1.596:1.732$

$C_{av}$ $=0.9213C_{rms}$ velocity.