Millikan oil drop experiment instrument capable of generating tiny charged oil drops by utilizing compressed air flow and experiment method

Abstract

The invention discloses a millikan oil drop experiment instrument capable of generating tiny charged oil drops by utilizing compressed air flow and an experiment method. For the experiment instrument, an air compressor is adopted for generating compressed air flow, and the air flow is sprayed at high speed from an air pipe and enters an atomizing cup, so that oil liquid in the atomizing cup oscillates in the boiling state and is atomized into tiny charged oil drops. The oil drops enter an oil drop box, and are observed after amplification and shooting by a microscopic vidicon, by measuring the static balance voltage and uniform-velocity falling speed of the oil drops, the carried charge amount of the oil drops can be obtained through calculation. For the experiment instrument, the large number of tiny charged oil drops can be rapidly generated for experiment measurement, the millikan oil drop experiment instrument has the advantages that the experiment speed is improved, the consumable items are saved, the residue is reduced, the cleaning is convenient, etc., and the millikan oil drop experiment instrument is particularly suitable for physics experiment teaching needing multi-user repeated use.

Description

technical field [0001] The invention relates to the technical field of physics teaching experiments, in particular to a Millikan oil drop tester and an experimental method that uses compressed air flow to generate tiny charged oil drops. Background technique [0002] The Millikan oil drop experiment is a classic experiment in the history of physics, and it is also an important teaching content in college physics experiment teaching. The principle is that the equilibrium voltage of the charged oil droplet can be measured according to the force balance condition in the electric field, and the mass and radius of the oil droplet can be measured by using the falling body method according to Stokes' law, and finally the oil droplet can be obtained after proper correction and theoretical calculation. The charge of the drop. [0003] The Millikan oil drop experiment needs to generate a large number of tiny charged oil droplets, and in the teaching practice of physics experiments, t...

AI Technical Summary

Problems solved by technology

However, commonly used atomization equipment often cannot meet the requirements. For example, the atomized oil droplets of the hand-held air pressure spray bottle are too large, and the oil droplets produced by the ultrasonic atomizer have almost no charge, so they are not suitable for experimental use.

In practice, the triangular thin-layer spray bottle is usually used to produce tiny charged oil droplets. However, the triangular thin-layer spray bottle uses manual pressing to generate airflow, so the atomization rate of the oil droplets is low, and it needs to be repeated many times to produce A sufficient number of oil droplets; on the other hand, the triangular thin-layer spray bottle will also produce a considerable number of larger oil droplets, which will accumulate in the oil mist hole of the oil drop tester and cause blockage, so during the experiment Frequent cleaning of oil mist holes is often required

In addition, in the current Millikan oil drop tester, the oil mist cup is separated from the atomizer rather than airtightly connected, so the external air dust can easily enter the oil mist hole and cause blockage

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