Which is equal to 1,500,000 hertz?

To solve this conversion, you need to know your metric prefixes: 'kilo' means 1,000 and 'mega' means 1,000,000. When converting from a smaller base unit (Hertz) to a larger unit (kiloHertz), you divide by the prefix's value. Dividing 1,500,000 Hertz by 1,000 gives you exactly 1,500 kHz. If you wanted to convert 1,500,000 Hertz into megahertz (MHz), you would divide by 1,000,000, which results in 1.5 MHz. Because 1.5 MHz is not an option, but 1500 kHz is, option A is the only correct mathematical equivalent.