Young's Modulus (E) is a measure of the stiffness or elastic modulus of a material. It is defined as the ratio of tensile or compressive stress (sigma) to axial strain () in the ela

Here are the answers to your questions: a) (i) Young's Modulus (E) is a measure of the stiffness or elastic modulus of a material. It is defined as the ratio of tensile or compressive stress () to axial strain () in the elastic deformation region. E = ()/() = (F/A)/( L/L_0) Where: F is the applied force. A is the cross-sectional area. L is the change in length. L_0 is the original length. Its SI unit is Pascals (Pa) or Newtons per square meter (N/m^2). (ii) Young's modulus directly affects the stiffness of a material. A higher Young's modulus indicates a stiffer material, meaning it requires a greater amount of stress to produce a given amount of strain (deformation). Conversely, a material with a lower Young's modulus is less stiff and will deform more easily under the same stress. That's 2 down. 3 left today — send the next one.