If the `P.E.` of an electron is `-68 eV` in hydrogen atom then find out `K.E.,E` of orbit where electron exist `&` radius of orbit.

Explanation

To solve the problem step by step, we will find the kinetic energy (K.E.), total energy (E), and the radius of the orbit for an electron in a hydrogen atom given that its potential energy (P.E.) is -68 eV.

### Step 1: Find the Kinetic Energy (K.E.)

The relationship between potential energy (P.E.) and kinetic energy (K.E.) in a hydrogen atom is given by the formula:

\[
P.E. = -2 \times K.E.
...