If the total energy of an electron is `-1.51 eV` in hydrogen atom then find out `K.E,P.E.`, orbit radius and velocity of the electron in that orbit.

Explanation

To solve the problem step by step, we will find the kinetic energy (K.E.), potential energy (P.E.), orbit radius, and velocity of the electron in a hydrogen atom given that the total energy (E) is -1.51 eV.

### Step 1: Find the Kinetic Energy (K.E.)
The total energy (E) of an electron in a hydrogen atom is given by the formula:
\[ E = K.E. + P.E. \]

From the relationship between kinetic and potential energy in a hydrogen atom, we know:
\[ P.E. = -2 \times K.E. \]
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