Which of the following statements with regard to stealth technology is/are correct?

1. Stealth objects have a very small radar cross-section and are coated with Radar Absorbing Material.

2. Stealth objects can be detected using specific frequencies.

3. Stealth objects are coated with metamaterials to increase the scattering of electromagnetic radiation.

Detailed Explanation of the Statements: Statement 1 is CORRECT: The main objective of stealth technology is to minimize an object's Radar Cross-Section (RCS)—which is a measure of how detectable an object is by radar. To do this, stealth aircraft or vessels utilize geometric shaping to deflect radar signals away from the source, and their surfaces are coated with Radar Absorbing Materials (RAM) (such as iron-ball paint or carbon composites) that capture the radio waves and dissipate their energy as heat. Statement 2 is CORRECT: No aircraft or object is entirely invisible to all radar systems. Stealth features are primarily optimized to evade high-frequency radar bands (like the X-band and Ku-band) used by military tracking and missile-guidance systems. However, they can still be detected using specific low-frequency radar bands (like VHF or UHF). The longer wavelengths of these frequencies interact with the physical dimensions of the aircraft (like the tail fins) and trigger a physical phenomenon called resonance, making tracking possible. Statement 3 is INCORRECT: This statement contains a classic physics trap. While advanced stealth applications do use artificially engineered metamaterials, they are used to decrease or eliminate radar scattering, not increase it. Metamaterials redirect or smoothly bend electromagnetic waves completely around an object (often called electromagnetic cloaking) or capture them so that no signal bounces back to the receiver. Increasing scattering would scatter radio waves wildly, making the object far more detectable to multi-static radar networks and defeating the entire premise of stealth.