Deep Dive: T5C07
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).
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2022-2026 Question Pool
Subelement: T5C
Reference: FCC Part 97.3
Key Concepts
Verified Content
Question from the official FCC Technician Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the T5C topic.