Millikan's Oil Drop Experiment Concepts

This video, part of the AP Physics Essentials series, explores the concept of elementary charge, the smallest unit of charge, as discovered by Robert Millikan in his oil drop experiment. The video explains how Millikan used an atomizer, microscope, and charged plates to measure the elementary charge, demonstrating that charge is quantized. It also discusses the forces acting on oil drops, including gravity, air resistance, and electromagnetic forces. The video further delves into the structure of atoms, highlighting the charges of protons, neutrons, and electrons, and explains the role of quarks in charge quantization.

Who discovered the elementary charge through the oil drop experiment?

• Albert Einstein

• Niels Bohr

• Isaac Newton

• Robert Millikan

What is the value of the elementary charge?

• 3.2 * 10^-18 C

• 3.2 * 10^-19 C

• 1.6 * 10^-18 C

• 1.6 * 10^-19 C

In Millikan's experiment, what was used to observe the oil drops?

• Camera

• Telescope

• Binoculars

• Microscope

What force acts against gravity on the oil drops in Millikan's experiment?

• Magnetic force

• Friction

• Air resistance

• Nuclear force

How did Millikan adjust the oil drops' movement in his experiment?

• By adjusting the voltage

• By altering the air pressure

• By modifying the oil density

• By changing the temperature

What does charge quantization imply?

• Charge can be any value

• Charge is always negative

• Charge is always zero

• Charge exists in discrete units

What are protons made of?

• Electrons

• Neutrons

• Quarks

• Photons

What is the charge of an up quark?

• 2/3 positive charge

• 1/3 positive charge

• 2/3 negative charge

• 1/3 negative charge

What is the charge of a neutron?

• Zero

• Variable

• Negative

• Positive

Which particle has a negative elementary charge?

• Proton

• Neutron

• Electron

• Photon