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Millikan's oil drop experiment establish...

Millikan's oil drop experiment established that

A

`e//m` ratio of electron

B

Mass of electron

C

Velocity of electron

D

Charge on the electron

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**Step-by-Step Solution:** 1. **Understanding the Experiment**: Millikan's oil drop experiment was designed to measure the charge of the electron. In this experiment, tiny oil droplets were sprayed into a chamber and allowed to fall under the influence of gravity. 2. **Application of Electric Field**: An electric field was applied to the chamber, which allowed Millikan to manipulate the motion of the oil droplets. By adjusting the electric field, he could make the droplets either rise or fall, depending on their charge. 3. **Balancing Forces**: Millikan was able to balance the gravitational force acting on the droplets with the electric force by adjusting the strength of the electric field. This balance allowed him to calculate the charge on the droplets. 4. **Quantization of Charge**: Through his experiments, Millikan observed that the charges on the oil droplets were always multiples of a smallest value. This smallest value was determined to be the charge of a single electron. 5. **Conclusion**: Millikan's oil drop experiment established that the charge of the electron is approximately \(1.6 \times 10^{-19}\) coulombs. This was a significant finding in the field of atomic physics. **Final Answer**: Millikan's oil drop experiment established that the charge on the electron is quantized and is approximately \(1.6 \times 10^{-19}\) coulombs. ---
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