Which is equal to 28400 kHz?

The correct choice represents a conversion from kilohertz (kHz) to megahertz (MHz). The key aspect to note here is the relationship between different units of frequency.

1 MHz is equivalent to 1,000 kHz. Therefore, to convert kilohertz to megahertz, you divide the number of kilohertz by 1,000.

For the given frequency of 28,400 kHz:

• When you divide 28,400 by 1,000, you get 28.400 MHz.

This conversion confirms that 28400 kHz is indeed equal to 28.400 MHz, making this option correct.

Understanding the conversion between these units is crucial for amateur radio technicians, as it helps in the proper tuning and operation of communication equipment. The other choices do not provide the correct equivalent frequency in megahertz, as they either misplace the decimal or do not accurately reflect the result of the conversion from kHz to MHz.