ARRL Technician Practice Exam

Which frequency is equal to 28,400 kHz?

1. 284.00 MHz

2. 28.400 MHz

3. 2.840 MHz

4. 0.284 MHz

The correct answer is: 28.400 MHz

The frequency of 28,400 kHz can be converted to megahertz (MHz) by recognizing that 1 MHz is equal to 1,000 kHz. To convert kilohertz to megahertz, you divide the kilohertz value by 1,000. So, when we take 28,400 kHz and divide it by 1,000, we get 28.400 MHz. This conversion accurately reflects the relationship between these two measures of frequency. The other options represent incorrect conversions. For instance, 284.00 MHz is an incorrect multiplication, and 2.840 MHz results from improperly dividing 28,400 kHz by 10,000 rather than 1,000. Lastly, 0.284 MHz is also an incorrect conversion based on misinterpretation of the scaling factor. This makes option B not only the correct conversion of 28,400 kHz but also a clear example of correctly applying the principles of frequency measurement units.