Which of the following statements is correct about the experiment that first mea

Question

Which of the following statements is correct about the experiment that first measured the charge of the electron?

The oil drop is suspended because there are no forces acting on the drop

The important result was that Coulomb attraction made all of the oil drops the same mass, regardless of type of oil    

The mass of the drop was determined by measuring its terminal velocity

The value for electron charge had an experimental error of about 35%

Light hitting the oil drops manipulated their movement in a way to create an interference pattern.

Explanation / Answer

The experiment in question is famous Mullukan's oil drop experiment...In this experiment, to determine radius of oil drop the electric field is switched off and terminal velocity is determined.Since radius calculated can be used find mass, hence terminal velocity measurement helps in determining mass of oil drop.

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