What is the abbreviation for megahertz?
The correct answer is D: MHz. The abbreviation for megahertz is MHz (capital M, lowercase h, capital Z). This follows standard SI (International System of Units) conventions for unit abbreviations.
Unit abbreviations follow specific rules: the first letter is capitalized if the unit is named after a person (like Hertz, named after Heinrich Hertz), and prefixes use standard capitalization (M for mega, k for kilo, m for milli, etc.). MHz is the correct, standardized abbreviation. Common mistakes include 'MH' (missing the z), 'mh' (wrong capitalization), or 'Mhz' (lowercase h instead of uppercase H).
Exam Tip
Megahertz abbreviation = MHz. Remember: The correct abbreviation is MHz (capital M, capital H, lowercase z). Hertz is named after a person, so H is capitalized.
Memory Aid
"**M**Hz = **M**ega **H**ertz (think 'MHz = MH' = Mega Hertz, capital M, capital H, lowercase z)"
Real-World Application
When you see '146.52 MHz' on your transceiver display, the 'MHz' is the abbreviation for megahertz. This is the standardized, correct abbreviation. Using the wrong abbreviation (like 'mhz' or 'MH') might cause confusion or be incorrect in technical documentation.
FCC Part 97.3Key Concepts
Why Other Options Are Wrong
Option A: Incorrect. 'MH' is missing the 'z' for hertz. The complete abbreviation is MHz.
Option B: Incorrect. 'mh' has wrong capitalization. The 'M' should be capital (for mega), 'H' should be capital (Hertz is named after a person), and 'z' should be lowercase.
Option C: Incorrect. 'Mhz' has lowercase 'h' instead of uppercase 'H'. Hertz is named after a person, so H should be capitalized.
题目解析
The correct answer is D: MHz. The abbreviation for megahertz is MHz (capital M, lowercase h, capital Z). This follows standard SI (International System of Units) conventions for unit abbreviations. Unit abbreviations follow specific rules: the first letter is capitalized if the unit is named after a person (like Hertz, named after Heinrich Hertz), and prefixes use standard capitalization (M for mega, k for kilo, m for milli, etc.). MHz is the correct, standardized abbreviation. Common mistakes include 'MH' (missing the z), 'mh' (wrong capitalization), or 'Mhz' (lowercase h instead of uppercase H).
考试技巧
Megahertz abbreviation = MHz. Remember: The correct abbreviation is MHz (capital M, capital H, lowercase z). Hertz is named after a person, so H is capitalized.
记忆口诀
**M**Hz = **M**ega **H**ertz (think 'MHz = MH' = Mega Hertz, capital M, capital H, lowercase z)
实际应用示例
When you see '146.52 MHz' on your transceiver display, the 'MHz' is the abbreviation for megahertz. This is the standardized, correct abbreviation. Using the wrong abbreviation (like 'mhz' or 'MH') might cause confusion or be incorrect in technical documentation.
错误选项分析
Option A: Incorrect. 'MH' is missing the 'z' for hertz. The complete abbreviation is MHz. Option B: Incorrect. 'mh' has wrong capitalization. The 'M' should be capital (for mega), 'H' should be capital (Hertz is named after a person), and 'z' should be lowercase. Option C: Incorrect. 'Mhz' has lowercase 'h' instead of uppercase 'H'. Hertz is named after a person, so H should be capitalized.
知识点
Megahertz, MHz, Unit abbreviations, SI units
Verified Content
Question from official FCC Technician Class question pool. Explanation reviewed by licensed amateur radio operators.