Time left 0:10:54Question 7Answer savedMarked out of 1.00Flag questionTipsQuestion textA wavelength of 4 km could be expected in:a.HFb.MFc.LFd.VLF

The wavelength of 4 km could be expected in VLF (Very Low Frequency).

Here's the step by step reasoning:

1. The frequency bands are categorized by their frequency ranges and each range corresponds to a specific wavelength range.

2. The HF (High Frequency) band has a frequency range of 3 to 30 MHz, which corresponds to a wavelength range of 10 to 100 meters.

3. The MF (Medium Frequency) band has a frequency range of 300 to 3000 kHz, which corresponds to a wavelength range of 100 to 1000 meters.

4. The LF (Low Frequency) band has a frequency range of 30 to 300 kHz, which corresponds to a wavelength range of 1 to 10 km.

5. The VLF (Very Low Frequency) band has a frequency range of 3 to 30 kHz, which corresponds to a wavelength range of 10 to 100 km.

6. Therefore, a wavelength of 4 km falls within the VLF band.