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6.1 Straight-line propagation of microwaves
Set up the transmitter (11) and receiver (19)
facing one another.
With the receiver off the rail, move it in a plane
perpendicular to the rail.
The optimum reception is when the horns are di-
rectly facing one another.
Conclusion: microwaves propagate in a straight
line (in uniform media or in a vacuum).
6.2 Penetration
Attach the dry absorption plate (14) (electrical
insulator) to the plate holder between the
transmitter and receiver.
Set the amplification (9) to a medium level.
Conclusion: microwaves can penetrate insula-
tors, as demonstrated by the reception of a sig-
nal.
6.3 Screening and absorption
Place the reflection plate (14) (electrical con-
ductor) between the transmitter and receiver.
Set the amplification to a low level.
Conclusion: electrical conductors can screen out
microwaves (metal plates), as demonstrated by
the fact that no signal is received.
Attach the absorption plate to the plate holder
having dampened both sides first.
Conclusion: When penetrating materials of low
conductivity, the microwaves are attenuated, i.e.
partially absorbed.
6.4 Reflection
Set up the basic configuration (5.1).
Line up the reflector plate at angles of approx-
imately 30°, 40°, 50° and 60° with the help of
the pointer for the rails, which points in the di-
rection of the normal (a line perpendicular to
the mirror's surface).
Change the angle of the long rail until the
maximum reception is attained.
Measure angles of incidence from the normal
(arrow).
Conclusion: an electrical conductor reflects mi-
crowaves. This confirms the law of reflection.
6. Sample experiments
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