In AM, the modulation frequency should beSelect one:a. Anything will workb. Greater than fcc. Equal to fcd. Lower than fc

To determine the appropriate modulation frequency in AM, we need to consider the following steps:

1. Understand the concept of AM modulation: AM stands for Amplitude Modulation, which involves varying the amplitude of a carrier signal in order to transmit information.

2. Determine the carrier frequency (fc): The carrier frequency is the frequency of the unmodulated signal that will be modulated. It is usually a high-frequency signal.

3. Consider the bandwidth limitations: In AM, the bandwidth required for transmission is twice the highest frequency of the modulating signal. This is known as the Nyquist criterion.

4. Choose a modulation frequency: The modulation frequency should be lower than the carrier frequency (fc) and within the bandwidth limitations. This ensures that the modulated signal can be properly transmitted and received.

5. Answering the question: Based on the given options, the correct answer is d. Lower than fc. The modulation frequency in AM should be lower than the carrier frequency to ensure proper modulation and transmission of the signal.

In summary, the modulation frequency in AM should be lower than the carrier frequency (fc) to ensure effective transmission of the modulated signal.