lf the diameter of the wire is doubled keeping its length same, what happens to its young's modulus of elasticity?

What is young's modulus of perfectly elastic body ?

If the lens is double concave then its focal length is

If the density of the earth is doubled, by keeping it’s radius constant, then what will be the acceleration due to gravity ?

The young's modulus, of the material of wood is Y. If we take another wire of the same material but twice as large in diameter and measure its young's modulus will it be 2Y ?

Two wires have diameters in the ratio 1:2 , length in the ratio 3:4 and young's moduli in the ratio 2:3. What is the ratio of elongations produced in the wires if they are subjected to the same streching force ?