The frequency range of 3 MHz to 30 MHz is used for

The radio waves of frequency ranging from 2 MHz to 30 MHz are called

The radio waves of frequency ranging from 2 MHz to 30 MHz are called

The mode of propagation used by short wave broadcast services having a frequency range from a few 3 MH_z "up to 30" MH_z is

The mode of propagation used by short wave broadcast services having a frequency range from a few 3 MH_z "up to 30" MH_z is

Which mode of propagation is used by short wave broadcast services having frequency range from a few MHz upto 30 MHz ? Explain diagrammatically how long distance communication can be achieved by this mode . Why is there an upper limit to frequency of waves used in this mode ?

Which mode of propagation is used by short wave broadcast services having frequency range from a few MHz upto 30 MHz ? Explain diagrammatically how long distance communication can be achieved by this mode . Why is there an upper limit to frequency of waves used in this mode ?