1. https://www. google. com/search

2. Cathode Ray Tube

3. physicists set out to study the atom using high voltage applied to a tiny amount of gas phase elements in a glass tube
negative
positive
cathode ray tube

4. Where are the rays coming from? How could the direction of the rays be
99.999%
0.001% of a gas phase element present
Where are the rays coming from?
How could the direction of the rays be
experimentally determined?

5. Scientists called the rays “cathode rays”.
From this experiment, it can be determined that the rays
originate at the _____________ and travel toward the
_____________ in ______________ lines.
cathode
straight
anode
Scientists called the rays “cathode rays”.

6. J.J. Thomson determiend that the particles that compose the cathode ray have the following properties:
They travel in straight lines.
They are independent of the composition of the material from which they originate (the cathode).

7. What is the charge on the cathode rays?
What experiments could be done to determine the charge?

8. Chapter 2: Atoms, Molecules and Ions
A magnetic field deflects charged particles at right angles to the magnetic field.
Physics
Positive particles will deflect in one direction & negative particles in the opposite direction.

9. What is the charge on the cathode rays?
What experiments could be done to determine the charge?
We are going to test the cathode rays with a magnet.

10. The results of this experiment
provided evidence that the cathode rays were charged particles.

11. What is the charge on the cathode rays?
What experiments could be done to determine the charge?
Capacitor plates: Electric Field

12. Capacitor plates: Electric Field
What will happen to the movement of a positive particle as it travels through this electric field? +
Bend up
Bend down
Travel in a straight line
Go faster
Go slower

13. Capacitor plates: Electric Field

14. Add capacitor plates to the tube.

15. When subjected to an electric field, the cathode rays will
bend up to location “P”
travel in a straight line to location “Q”
bend down to location “R”

16. Let’s do the experiment.

17. Conclusion:
Cathode rays have a ___________ charge.
negative

18. One more experiment, placing a paddle wheel
in the path of the cathode rays.

19. What can be concluded about the nature
of cathode rays?
Cathode rays must be composed of particles
that have mass.

20. Adding a magnetic field and an electric field to the CRT