Question

Millikan's famous oil drop experiment established that

• A. Electric charge is quantized
• B. Mass is quantized
• C. Energy of an atom is quantized
• D. Workfunction is quantized

Hint:

Millikan’s oil drop experiment measured the elementary charge \(e\), proving charge quantization.

Answer 1

The Correct Option is A

Step 1: Experiment Description
In 1909, Millikan levitated charged oil droplets between electrically charged plates. He then observed their movement influenced by gravity and an electric field.
Step 2: Main Result
Millikan discovered that the charge of each droplet was a multiple of a fundamental unit: \[q = n \times e, \quad e = 1.602 \times 10^{-19} \, C\] This demonstrated the quantization of electric charge.
Final Answer: \[ \boxed{\text{Electric charge is quantized}} \]