1. Light Electrons have discrete energy levels
Electrons drop an energy level.
Light is emitted/absorbed?
Electrons gain an energy level.
Light is emitted/absorbed?

2. Can you label the parts of the gun?
Electron gun
cathode
grid
anodes
y-plates
x-plates
fluorescent screen
Can you label the parts of the gun?

3. How does it work?
Electrons strike the fluorescent screen and seen as a spot of light
The electrons are attracted to the anodes and accelerated
Electron beam passes through the X and Y plates
Hot metal filament emits electrons

4. Kinetic energy = Charge x Voltage
KE=QV
You can treat the electron beam as a flow of electrons:
Kinetic energy = Charge x Voltage
KE=QV
Kinetic energy measured in Joules (J)
Charge measured in Coulombs (C)
Voltage measured in volts (V)

5.   x KE Q Formula triangles
Formula triangles help you to rearrange formula. The triangle for the kinetic energy for an electron beam is shown below:
Whatever quantity you are trying to find cover it up and it will leave you with the calculation required.
…and you are left with the sum…
So if you were trying to find charge, Q…..
Q = KE V KE  
…you would cover Q up… Q V x

6. Formula triangles
This is a flash movie – click on the letter you want to cover to start the animation.

7. Uses of electron beams? Oscilloscopes TV tubes Electroplating
X ray production
Monitors
Combustion engines

8. What are the units of pressure?
Metres
Joules
Newtons
Pascals 

9. What is 225K in Celsius temperature?

10. What is 333°C in Kelvin temperature?

11. A gas at a pressure of 60Pa at a temperature of 50K in a sealed container is compressed to a pressure of 480Pa. What is the new temperature of the gas? 8K
80K
6.2K
400K 

12. Which of the following is not a use of electron beams?
Oscilloscopes
Monitors
Spray painting
X ray production 