The waves in that direction are reflected back 180?and the reflection reverses the polarization sense, so the reflected waves reinforce the forward radiation.
32.
Assuming deformation in the specimen is uniform, the stress and strain can be calculated from the amplitudes of the incident, transmitted, and reflected waves.
33.
For these interference patterns to occur though, there must not simply be the presence of a reflected wave but a change in the reflected wave.
34.
As the reflected wave passes the receiver for a second time, this time from the opposite direction, it now has enough amplitude to be detected.
35.
To avoid radar, the designers have used highly secret radar absorbing materials on many surfaces which damp any reflected waves and reduce the signal's strength.
36.
For these interference patterns to occur though, there must not simply be the presence of a reflected wave but a change in the reflected wave.
37.
Microphones at the surface record the reflected waves, and the data collected allow geophysicists to produce an image of the subsurface without drilling a single well.
38.
The second method, which involved finding the angle of incidence of the reflected waves at the receiver, showed for sure that they were coming from above.
39.
Careful attention has been paid to the alignment of many panel boundaries and edges, to direct reflected waves away from the aircraft in uniformly narrow angles.
40.
Now it follows from this, that for any finite-sized object there must be some wavelength at which the incoming waves and the reflected waves reinforce eachother.
