Which of the following is used to determine RF exposure from a transmitted signal?
Its duty cycle
Its frequency
Its power density
All these choices are correct✓الإجابة الصحيحة
الشرح
Exposure is assessed from the power density in the field, from the frequency, because the permitted limits vary with frequency, and from the duty cycle, because the limits apply to a time-averaged value. All three enter the calculation, so no single one is sufficient.