Question

If the collision frequency of a gas at 1 atm pressure is $Z$, then its collision frequency at 0.5 atm is :

• A. $1.0Z$
• B. $0.707Z$
• C. $2Z$
• D. $0.5Z$

Answer 1

The correct option is C $2Z$

As we know,
$Collisionfrequency\left(Z\right)\propto \frac{1}{P}$

$Z_1\times P_1=Z_2\times P_2$

$Z\times 1=Z_2\times 0.5$

$Z_2=\frac{Z\times 1}{0.5}$

$Z_2=2Z$

$Collisionfrequency=2Z$.

Hence, option $C$ is correct.