What do the retensive properties of the loaded core of a RAS do to the EM energy entering it?

The retensive properties of the loaded core of a Radar Absorbent Structure (RAS) are designed to interact with electromagnetic (EM) energy in a specific way. When EM energy enters the loaded core, the retensive properties are primarily focused on minimizing the energy that can be reflected back into the environment.

In essence, "weakening" the EM energy means that the core dissipates the energy, causing it to lose intensity as it interacts with the materials within the core. This can involve mechanisms such as absorption, scattering, or conversion of EM energy into other forms of energy, such as heat. These mechanisms ensure that the bulk of the energy that enters the core does not bounce back, thereby enhancing low observability for the aircraft.

The other options do not accurately reflect the primary function of the RAS core. Amplifying, reflecting, or outright absorbing EM energy in a manner that allows it to return to the source or to be effectively utilized does not align with the goals of reducing detectable signatures in sensitive applications like stealth technology. The emphasis is on reducing the integrity of the wavefront as it passes through the loaded core, which fundamentally correlates with the concept of "weakening" the incoming energy.