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Question 401

Why do exposure limits vary with frequency?

  1. Lower frequency RF fields have more energy than higher frequency fields
  2. Lower frequency RF fields do not penetrate the human body
  3. Higher frequency RF fields are transient in nature
  4. The human body absorbs more RF energy at some frequencies than at othersCorrect answer

Explanation

How much RF energy the body absorbs depends on frequency, because the body and its limbs are resonant at some frequencies and absorb energy far more efficiently there than at others. The limits are set tighter where absorption is greatest, roughly the VHF range.

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Question 401: Why do exposure limits vary with frequency? · FCC Technician Class (Element 2) · Questena