From Bohr model of hydrogen atom:
The total energy of an electron is negative and equals half of its potential energy in magnitude.
Using energy relation:
\[ E = -K \]
Therefore, kinetic energy is equal in magnitude and opposite in sign to total energy.
So the ratio becomes:
\[ K : E = 1 : -1 \]
Thus, the required ratio is:
\[ 1 : -1 \]