Which of the following is used to determine RF exposure from a transmitted signal?
The correct answer is D: All these choices are correct. What is used to determine RF exposure from a transmitted signal includes: its duty cycle, its frequency, and its power density. All three factors are used to calculate RF exposure. For amateur radio operators, this is how RF exposure is evaluated. Understanding this helps ensure compliance with RF safety regulations.
Exam Tip
All three determine RF exposure: duty cycle, frequency, power density. When all listed factors are used to determine RF exposure, 'all of the above' is usually the answer. All are used in RF exposure calculations.
Memory Aid
"All three determine RF exposure: Duty cycle, Frequency, Power density. Think 'A'll 'R'F 'E'xposure 'F'actors. All three factors are used to calculate RF exposure. Essential for RF safety evaluation."
Real-World Application
RF exposure evaluation: (1) Duty cycle - how much time the transmitter is on (affects average power), (2) Frequency - different frequencies have different absorption rates, (3) Power density - the power per unit area at a given distance. All three factors are used to calculate RF exposure. This is how RF exposure is determined.
FCC Part 97.13Key Concepts
Why Other Options Are Wrong
Option A: While correct, this is incomplete. Frequency and power density are also used.
Option B: While correct, this is incomplete. Duty cycle and power density are also used.
Option C: While correct, this is incomplete. Duty cycle and frequency are also used.
题目解析
The correct answer is D: All these choices are correct. What is used to determine RF exposure from a transmitted signal includes: its duty cycle, its frequency, and its power density. All three factors are used to calculate RF exposure. For amateur radio operators, this is how RF exposure is evaluated. Understanding this helps ensure compliance with RF safety regulations.
考试技巧
All three determine RF exposure: duty cycle, frequency, power density. When all listed factors are used to determine RF exposure, 'all of the above' is usually the answer. All are used in RF exposure calculations.
记忆口诀
All three determine RF exposure: Duty cycle, Frequency, Power density. Think 'A'll 'R'F 'E'xposure 'F'actors. All three factors are used to calculate RF exposure. Essential for RF safety evaluation.
实际应用示例
RF exposure evaluation: (1) Duty cycle - how much time the transmitter is on (affects average power), (2) Frequency - different frequencies have different absorption rates, (3) Power density - the power per unit area at a given distance. All three factors are used to calculate RF exposure. This is how RF exposure is determined.
错误选项分析
Option A: While correct, this is incomplete. Frequency and power density are also used. Option B: While correct, this is incomplete. Duty cycle and power density are also used. Option C: While correct, this is incomplete. Duty cycle and frequency are also used.
知识点
RF exposure, Duty cycle, Frequency, Power density
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.