2. Content Introduction Microwaves Properties
Different kinds of Microwaves
Reflection
Diffraction
Interference
Stationary wave
Application

3. What are Microwaves ? electromagnetic waves
wavelenght between 1mm and 10mm
generated by klystron valves in the lab
detected by a special receiver

4. Properties of Microwves
use a microwave transmitter
can pass through a thick book
can not pass throug metal sheets
can be reflected by a sheet of aluminium and focused by a concave aluminum dishes
diffraction accurs when passing through a gap between two aluminium plates

5. a little of the energy is absorbed and reflected on the way through
rain absob some microwave energy
all materials getting warmer when absorb some of the microwave energy

6. Reflection of microwave

7. Diffraction of microwave

8. Interferemce of microwave

11. Stationary microwave

12. Reflection , absorption and transmission of microwave ( the no
Reflection , absorption and transmission of microwave ( the no . means energy)

14. Uses of Microwaves Intercity telephone links
microwave beam is used carry telephone conversation between cities
beam can carry more conversation than wire
Satellite links
microwave beam carry television pictures

15. aimed at a satellite postion between two contients
satellite receives and amplifies the beam before it back to receive aerials on the ground
Cooking
microwaves are used to in special ovens cook food right through very rapidly
can cook our brain and interal organ if we got in their way

16. Phyics Examinations Course
The End
References :
Physics Alive
Phyics Examinations Course
Physics Beyond 2000