Average lifetime of a hydrogen atom excited to n = 2 state is `10^(-8)`s. Find the number of revolutions made by the electron on the average before it jumps to the ground state.

Explanation

To find the number of revolutions made by the electron in a hydrogen atom excited to the n = 2 state before it jumps to the ground state, we can follow these steps:

### Step 1: Calculate the radius of the electron's orbit in the n = 2 state.
The formula for the radius \( r \) of the electron in the nth orbit of a hydrogen atom is given by:

\[ r_n = a_0 \cdot \frac{n^2}{Z} \]
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