The Amplitude Modulated (AM radio) carrier frequencies are in the frequency range 535-1605 kHz.

Carrier frequencies of 540 to 1600 kHz are assigned at 10 kHz intervals.

AM radio uses the electrical image of a sound source to modulate the amplitude of a carrier wave.

At the receiver end in the detection process, that image is stripped back off the carrier and turned back into sound by a loudspeaker.

When information is broadcast from an AM radio station, the electrical image of the sound (taken from a microphone or other program source) is used to modulate the amplitude of the carrier wave transmitted from the broadcast antenna of the radio station.

This is in contrast to FM radio where the signal is used to modulate the frequency of the carrier.