Calculate the velocity of the electron in the third orbit of hydrogen atom
Hint `: v= ( 2.18 xx 10^(6)z)/( n) m//s`

Explanation

To calculate the velocity of the electron in the third orbit of a hydrogen atom, we can use the formula provided:

\[ v = \frac{2.18 \times 10^6 \cdot z}{n} \, \text{m/s} \]

### Step-by-Step Solution:

1. **Identify the values for z and n:**
- For hydrogen, the atomic number \( z = 1 \).
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