用牛顿环测平凸透镜的曲率半径（Measuring radius of curvature of Plano convex lens by Newton ring）.doc

用牛顿环测平凸透镜的曲率半径（Measuring radius of curvature of Plano convex lens by Newton ring） Own collection Think its useful So upload it to Baidu Share it with everyone! Dense Reagan oil drop test [experimental purposes] 1. measurement of movement of charged droplets in gravitational and electrostatic fields Verifying the discontinuity of charge The charge value of the electron was determined by e 2. adjust the instrument by experiment The choice of oil drops, patient tracking and measurement, and data processing Train students serious and meticulous scientific experiment methods and attitudes [teaching methods] Research style Defensive teaching method [experimental principle] Static (balance) measurement Use an atomizer to spray oil droplets into two parallel plates placed horizontally apart from D Oil is cracked when sprayed into oil droplets Its usually charged The quality of the oil drop is m The charge is Q The voltage between the two plates is V The oil droplets will be simultaneously subjected to the effects of gravity mg and electrostatic force qE on parallel plates As shown in Figure 1 If the voltage between the two plates is adjusted, V The two forces can be balanced At this time (1) From the top view To measure the amount of energy that the oil drops, Q: except for the determination of V and D The quality of the oil droplets must be measured M Because m is very small Must be measured by the following special method: parallel plate without voltage The oil droplets are accelerated by gravity Due to the action of air resistance Fall into a certain distance; reach a certain speed; VG Resistance FR and gravity mg balance As shown in Figure two The drops will fall at uniform speed, according to Stokess law When the oil drops at uniform speed (2) The viscosity coefficient of the air A is the radius of the oil drop The density of the oil is The quality of the oil drops is m, which can be expressed by the lower type (3) By (2) and (3) The radius of the oil drop (4) For a sm