Traditional Culture Encyclopedia - Photography and portraiture - What are the college physics experiments?
What are the college physics experiments?
1, Young's modulus
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.
2. Michelson interferometer
Michelson interferometer is a kind of precision optical instrument designed and manufactured by American physicists Michelson and Morley in 188 1, which is used to study the "ether" drift. It uses amplitude division method to generate double beams to realize interference.
3. Equal thickness interference
Equal thickness interference is an interference fringe formed by parallel light incident on the upper and lower surfaces of thin films with uniform thickness and refractive index. The same interference fringes are formed where the film thickness is the same, so it is called equal thickness interference. (Newton's ring and wedge plate interference belong to equal thickness interference. )
4, the use of oscilloscope
The wave device is a narrow electron beam composed of high-speed electrons hitting the screen coated with fluorescent substances, which can produce tiny light spots (this is the working principle of the traditional analog oscilloscope).
5, bridge method to measure resistance
Typical four-line measurement method is adopted. In order to improve the accuracy of measuring resistance (especially low resistance). Program-controlled constant current source, program-controlled preamplifier and A/D converter constitute the main body of the measuring circuit. The central control unit applies constant and high-precision current to the measured external load by controlling the constant current source, and then processes the obtained data (including test voltage, current test current, etc.). ) to obtain the actual resistance value.
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