Review Atomic Theories

In the Gold Foil Simulation, you send alpha particles toward a thin sheet of gold. Most pass through without deflection. What does this mean?

• A. Alpha particles are invisible

• B. Atoms are mostly empty space

• C. Gold has no electrons

• D. Alpha particles have no mass

In the Gold Foil Experiment, why did Rutherford expect all alpha particles to pass straight through the foil?

• A. He believed atoms were solid spheres

• B. He believed in the “plum pudding” model

• C. He thought alpha particles were too light

• D. He thought gold atoms were smaller than alpha particles

When exploring the Millikan Oil Drop Simulation, you adjust the electric field until an oil droplet is suspended in mid-air. What is this point called?

• A. Critical drop point

• B. Equilibrium point

• C. Terminal velocity

• D. Static levitation

In the Oil Drop Experiment, why is it important to balance the gravitational force and the electric force on the droplet?

• A. To make it glow

• B. To measure the charge of an electron

• C. To remove air resistance

• D. To make the oil lighter

Which of these observations in the cathode ray simulation helped Thomson conclude that electrons are part of all atoms?

• A. The beam was always the same regardless of the metal used

• B. The beam disappeared without electricity

• C. The beam could not pass through glass

• D. The beam moved faster in water

When exploring the Millikan Oil Drop Simulation, you adjust the electric field until an oil droplet is suspended in mid-air. What is this point called?

• A. Critical drop point

• B. Equilibrium point

• C. Terminal velocity

• D. Static levitation

In the Oil Drop Experiment, why is it important to balance the gravitational force and the electric force on the droplet?

• A. To make it glow

• B. To measure the charge of an electron

• C. To remove air resistance

• D. To make the oil lighter

In the Cathode Ray Tube simulation, what happens when you turn on the battery and connect the plates?

• A. A glowing beam travels from the positive plate to the negative plate

• B. A glowing beam travels from the cathode (negative) to the anode (positive)

• C. Nothing happens unless there is air inside

• D. The beam moves in circles

Why do these three experiments (Gold Foil, Millikan Oil Drop, Cathode Ray) still matter today?

• A. They are fun to do in school

• B. They were the first experiments with electricity

• C. They are easy to understand

• D.They proved the nucleus, electrons, and electron charge which are still foundations of modern science