What is another way to specify a radio signal frequency of 1,500,000 hertz?

A frequency of 1,500,000 hertz can be expressed in kilohertz (kHz) by dividing the frequency in hertz by 1,000, since 1 kHz is equal to 1,000 hertz.

Therefore, 1,500,000 hertz divided by 1,000 equals 1,500 kHz. Thus, specifying the frequency as 1500 kHz is correct because it accurately represents the original frequency using the appropriate unit of measurement.

In contrast, the other options represent different frequency values: 1500 MHz would be equivalent to 1,500,000,000 hertz, which is much higher; 15 GHz corresponds to 15,000,000,000 hertz, which is also significantly higher; and 150 kHz is much lower at 150,000 hertz. These discrepancies confirm that the correct representation of 1,500,000 hertz is indeed 1500 kHz.