What is the unit of frequency?
The correct answer is A: Hertz. The unit of frequency is the hertz (abbreviated as 'Hz'), named after Heinrich Hertz who demonstrated radio waves. One hertz equals one cycle per second.
Frequency measures how many times something repeats per second. In radio, frequency tells us how many times the electromagnetic wave oscillates per second. 1 Hz = 1 cycle/second, 1 kHz = 1,000 cycles/second, 1 MHz = 1,000,000 cycles/second. Frequency is fundamental to amateur radio - every band and every signal has a frequency. The hertz is the standard unit used worldwide for frequency measurement.
Exam Tip
Frequency = Hertz. Remember: Frequency is measured in hertz (Hz). One hertz = one cycle per second.
Memory Aid
"**F**requency = **H**ertz (think 'F = H' = Frequency = Hertz, Hz)"
Real-World Application
You're operating on 146.52 MHz. The 'MHz' stands for megahertz - millions of hertz. This means the radio wave oscillates 146,520,000 times per second. Frequency tells you how fast the wave is oscillating, and hertz is the unit that measures this oscillation rate.
FCC Part 97.3Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Henry is the unit of inductance, not frequency.
Option C: Incorrect. Farad is the unit of capacitance, not frequency.
Option D: Incorrect. Tesla is the unit of magnetic flux density, not frequency.
题目解析
The correct answer is A: Hertz. The unit of frequency is the hertz (abbreviated as 'Hz'), named after Heinrich Hertz who demonstrated radio waves. One hertz equals one cycle per second. Frequency measures how many times something repeats per second. In radio, frequency tells us how many times the electromagnetic wave oscillates per second. 1 Hz = 1 cycle/second, 1 kHz = 1,000 cycles/second, 1 MHz = 1,000,000 cycles/second. Frequency is fundamental to amateur radio - every band and every signal has a frequency. The hertz is the standard unit used worldwide for frequency measurement.
考试技巧
Frequency = Hertz. Remember: Frequency is measured in hertz (Hz). One hertz = one cycle per second.
记忆口诀
**F**requency = **H**ertz (think 'F = H' = Frequency = Hertz, Hz)
实际应用示例
You're operating on 146.52 MHz. The 'MHz' stands for megahertz - millions of hertz. This means the radio wave oscillates 146,520,000 times per second. Frequency tells you how fast the wave is oscillating, and hertz is the unit that measures this oscillation rate.
错误选项分析
Option B: Incorrect. Henry is the unit of inductance, not frequency. Option C: Incorrect. Farad is the unit of capacitance, not frequency. Option D: Incorrect. Tesla is the unit of magnetic flux density, not frequency.
知识点
Frequency, Hertz, Frequency units, Cycles per second
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.