4.2-Structure of the Nuclear Atom-1

What are sub-atomic particles, such as protons, electrons, and neutrons, collectively called?

• Electromagnetic particles

• Atomic particles

• Fundamental particles

• Electron clouds

Who was the English physicist known for discovering electrons?

• Ernest Rutherford

• Robert A. Millikan

• J. J. Thomson

• Marie Curie

In which year were electrons discovered?

• 1801

• 1897

• 1923

• 1956

What is the charge of electrons?

• Positively charged

• Negatively charged

• No charge

• Variable charge

What experiment did J. J. Thomson perform to discover electrons?

• Cathode-ray tube experiment

• Oil drop experiment

• Electromagnetic experiment

• Photoelectric experiment

Which electrode in the cathode-ray tube is negatively charged?

• Anode

• Cathode

• Neutron

• Proton

In the cathode-ray tube experiment, which direction do cathode rays bend towards?

• Anode

• Cathode

• Neutron

• Proton

What did J. J. Thomson name electrons?

• Electromagnetic waves

• Corpuscles

• Neutron

• Proton

Who calculated the mass and charge of electrons?

• Ernest Rutherford

• J. J. Thomson

• Robert A. Millikan

• Marie Curie

What is the name of Robert A. Millikan's famous experiment for calculating the charge of electrons?

• Electron Cloud Experiment

• Cathode-ray Tube Experiment

• Oil Drop Experiment

• Nuclear Fusion Experiment