College physics experiments include: Young's modulus, Michelson interferometer, holography, diffraction grating, single slit diffraction, photoelectric effect, measuring the refractive index of glass with spectrometer, measuring the base point of lens group, measuring the propagation speed of wave and Millikan oil drop experiment.

Young's modulus is a physical quantity that describes the deformation resistance of solid materials. When a metal wire with a length of L and a cross-sectional area of S is extended by a force F, F/S is called stress, and its physical meaning is the force per unit cross-sectional area of the metal wire; Δ l/l is called strain, and its physical meaning is the elongation corresponding to the unit length of metal wire.

characteristic

According to different stress conditions, there are corresponding tensile elastic modulus (Young's modulus), shear elastic modulus (rigid modulus) and volume elastic modulus. It is a material constant, which represents the ability of material to resist elastic deformation, and its value reflects the difficulty of elastic deformation of material.

For general materials, this value is relatively stable, but for polymers, it obviously depends on conditions such as temperature and loading rate. If the stress-strain curves of some materials are not linear in the elastic range, tangent elastic modulus and secant elastic modulus can be used instead of elastic modulus as needed.