Final answer:
Radio stations use AM and FM frequency bands to transmit signals. AM broadcasts in the 540 to 2830 kHz range with varying amplitude, while FM broadcasts in the 88 to 108 MHz range with varying frequency.
Step-by-step explanation:
Radio stations broadcast signals on two different frequency bands called AM (Amplitude Modulation) and FM (Frequency Modulation). AM signals are found in the frequency range of 540 to 2830 kHz and are characterized by changes in the amplitude of the wave to carry information. FM signals operate at higher frequencies, specifically between 88 to 108 MHz, and carry information via changes in the wave's frequency while maintaining constant amplitude. In the context of FM radio, the term 'frequency modulation' refers to this process of encoding information, which can produce a clearer audio signal free from static and noise that is common in AM signals. Moreover, FM radio's frequency range fits within the VHF (very high frequency) band used also for television broadcasting.