Cathode Rays

Question

Answer

Plucker placed what on each end of a glass vacuum tube?

What were these called?

What was created when the ^ where connected to an external high-voltage source?

Which electrode glowed?

What was the charge of that electrode?

What electrode did the glow originate from?

What colour did it glow?

What did the Maltese Cross experiment identify about cathode rays

What did the paddle wheel experiment identify about cathode rays?

What was concluded about cathode rays when magnets were placed on each side of the tube?

He found this using the combined equation q/m=

What actually are Cathode rays made up of?

What was initially the conclusion obtained from placing electric plates on each side of the tube?

At lower pressures, what can electrons do in cathode ray tubes?

The first effect that can be seen in cathode ray tubes is?

The positive column is broken into what as pressure decreases?

These are separated by?

The colours of the discharge depend on what?

Name a gas used when using cathode tubes for lighting?

What equation do you use to calculate the electrical field intensity using force and charge?

Electric field strength is calculated using the formulae:

Since W=Fd, then W also equals:

What is work done equal to?

Since this is equivalent to kinetic energy, W=

J.J. Thomson finally proved a hypothesis regarding the actual effect of electric fields on cathode rays. What was the real electric charge of cathode rays?

What equation calculates the force experienced by a particle in a magnetic field when the magnetic field is perpendicular to the particle's velocity?

If they are not perpendicular, what is the RHS of the equation multiplied by?

J.J. Thomson used what to create uniform magnetic and electric fields?

By equating the magnetic and electric force equations when the beam was undeflected, Thomson was able to determine what?

The electrons undergo what motion due to the magnetic field?

This meant that when the radius of the path was calculated, Thomson could obtain what?

Why weren't scientists initially able to see the deflection in electric fields?

What effect explains the emission of electrons from the cathode surface?

List the two main uses of cathode ray tubes