According to https://en.wikipedia.org/wiki/Young's_modulus, it is the slope of the elastic portion (the linear part at the start) of the curve. That makes B correct.songoku said:
Young's Modulus, also known as the elastic modulus or modulus of elasticity, is a measure of the stiffness of a material. It represents the ratio of stress to strain in a material under tensile or compressive forces.
Young's Modulus is calculated by dividing the stress (force per unit area) applied to a material by the strain (change in length per unit length) of the material. This calculation is typically done in a controlled laboratory setting using specialized equipment.
The materials with the greatest Young's Modulus are typically metals and ceramics, such as steel, titanium, and tungsten. These materials have strong atomic bonds and are able to withstand high levels of stress without significant deformation.
The higher the Young's Modulus of a material, the stiffer and more rigid it is. This means that it will be less likely to deform under stress and will have a higher resistance to external forces. However, a high Young's Modulus can also make a material more brittle and prone to fracture.
Yes, Young's Modulus can change depending on various factors such as temperature, strain rate, and microstructure of the material. For example, at higher temperatures, materials tend to have a lower Young's Modulus due to increased molecular motion and decreased stiffness. Additionally, different manufacturing processes can also affect the Young's Modulus of a material.