The ratio of the escape velocity and the orbital velocity is

What is the ratio of the escape velocity to the orbital velocity for a satellite revolving near the earth's surface?

Obtain the relation between escape velocity and critical velocity when satellite is orbiting very close to earth. OR Show//prove that the escape velocity of a satellite orbiting round the earth is equal to sqrt2 time its critical velocity. OR Show that V_e = sqrt2. V_c for a satellite orbiting round the earth.

Define escape velocity.