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Can the B 2 be detected by radar?
The B 2 has two major defenses against radar detection. The first element is the plane's radar-absorbent surface. The radio waves used in radar are electromagnetic energy, just like light waves. In the same way that certain materials absorb light very well (black paint, for example), some materials are particularly good at absorbing radio waves.
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The B-2's body is mainly composed of composite material -- combinations of various lightweight substances. The composite material used in the B 2 bomber is specifically designed to absorb radio energy with optimum efficiency. Parts of the B 2, such as the leading edge, are also covered in advanced radio-absorbent paint and tape. These materials are very expensive, and the Air Force has to reapply them regularly. After every flight, repair crews have to spend many hours examining the B 2 to make sure it's fit for stealth missions.
The B 2 is designed to contain its own radio signals, the electromagnetic energy generated by onboard electronics. The plane does emit radio energy when using its radar scanner or communicating with ground forces and other aircraft, but the radar signal is small and highly focused, making it less susceptible to detection.