Exam-style question
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What is the principle behind Millikan's oil-drop experiment?.
- A.Measuring the charge of oil droplets in an electric field
- B.Determining the mass of oil droplets using gravitational force
- C.Observing the deflection of light through oil droplets
- D.Calculating the density of oil using buoyancy
Model answer
What a good answer should say
- Measuring the charge of oil droplets in an electric field
Explanation
Why this works
Millikan's oil-drop experiment involved balancing the gravitational force on tiny charged oil droplets with an electric force, allowing for the measurement of the charge on the droplets.
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