Calculate the electronic velocity in the first Bohr orbit of hydrogen.

Explanation

To calculate the electronic velocity in the first Bohr orbit of hydrogen, we can follow these steps:

### Step 1: Identify the parameters
For hydrogen, the atomic number (Z) is 1, and we are considering the first Bohr orbit, so the principal quantum number (n) is also 1.

### Step 2: Use the formula for the velocity of an electron in the nth orbit
The velocity (v) of an electron in the nth orbit of a hydrogen atom can be calculated using the formula:
\[ v = \frac{2.18 \times 10^6 \, Z}{n} \, \text{m/s} \]
...