3B SCIENTIFIC PHYSICS 1009950 Manual De Instrucciones página 11

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
4