Calculate the temperature at which the average velocity of oxygen equals that of hydrogen at `20 K`.

Explanation

To solve the problem of calculating the temperature at which the average velocity of oxygen equals that of hydrogen at 20 K, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Average Velocity**:
The average velocity (v) of a gas is given by the formula:
\[
v = \sqrt{\frac{8RT}{\pi m}}
...