The value of acceleration due to gravity 'g' on the surface of the moon with radius 1/2 that of the earth and same mean density as that of the earth

The value of acceleration due to gravity 'g' on the surface of a planet with radius double that of the earth and same mean density as that of the earth is ( g_(e) =acceleration due to gravity on the surface of the earth )

The value of acceleration due to gravity .g_p. on the surface of a planet with radius double that of earth and same mean density as that of the earth is ( g_e to acceleration due to gravity on the surface of earth)

What is the value of acceleration due to gravity on the surface of the moon ? Given that the mass of the moon is 1//80 times that of the earth and diameter of the moon is 1//4 times that of earth (g=9.8m//s^2) .

The acceleration due to gravity on the surface of the moon is (1)/(6)th of that on the surface of earth and the diameter of the moon is one-fourth that of earth. The ratio of escape velocities on earth and moon will be