Technician exam question T0C02
Subelement T0, SAFETY· Group T0C
Which of the following bands has the lowest maximum permissible exposure for RF safety?
- A.3.5 MHz
- B.50 MHz (correct answer)
- C.440 MHz
- D.1296 MHz
Why50 MHz is the band with the lowest maximum permissible exposure for RF safety. The FCC's exposure limits are most restrictive in the frequency range where the human body absorbs RF energy most efficiently, roughly 30 to 300 MHz, and among the choices given, 50 MHz falls squarely in that range, giving it the lowest maximum permissible exposure, answer B. 3.5 MHz (A) is low enough that the body couples to it poorly, and 440 MHz and 1296 MHz (C, D) are high enough that the whole-body resonance effect has diminished, so all three carry more permissive limits than 50 MHz.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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