Frequency band for standard AM broadcast is

Question

Accepted Answer

The correct frequency band for standard AM (Amplitude Modulation) broadcast is 540-1600 KHz, which corresponds to Option 2. Here is a detailed explanation supporting this:

1. **Explanation for Option 2 (540-1600 KHz):**
   - AM broadcasting is a method of radio broadcasting using amplitude modulation. The standard AM broadcast band is allocated within the frequency range of 540 to 1600 KHz. This range is specifically designated for AM radio stations, allowing them to transmit audio signals over long distances. The relatively low frequency of AM signals enables them to travel further than higher frequency signals, especially at night when atmospheric conditions allow for better propagation.

2. **Explanation for why other options are incorrect:**

- **Option 1 (88-108 MHz):**
     - This frequency range is allocated for FM (Frequency Modulation) broadcasting, not AM. FM radio operates in the VHF (Very High Frequency) band and is known for providing higher sound quality and less susceptibility to interference compared to AM. Therefore, this range is not used for standard AM broadcasts.

- **Option 3 (54-72 MHz):**
     - This frequency range is part of the VHF television band, specifically for TV channels 2 through 4 in many regions. It is not used for AM radio broadcasting. AM radio requires a different frequency allocation to accommodate its transmission characteristics.

- **Option 4 (3.7-4.2 GHz):**
     - This frequency range falls within the C-band, which is primarily used for satellite communications and some wireless broadband services. It is far too high for AM broadcasting, which operates in the medium frequency (MF) band. The characteristics of this band are not suitable for AM radio transmission.

In conclusion, Option 2 (540-1600 KHz) is the correct frequency band for standard AM broadcast, as it is specifically allocated for AM radio stations, allowing them to effectively transmit audio signals over long distances. The other options are incorrect as they pertain to different types of broadcasting or communication services.