Long distance radio broadcasts use short wave bands. Explain why?

A : Long distance radio broadcasts use short-wave bands. R : Ionosphere reflects waves in these bands.

Long distance short-wave radio broadcasting uses

(A) : For long distance transmission of radio waves, short wave bands are used. (R) : Short waves are reflected from ionosphere.

The FM radio broadcasting band is,

The short wave Radio broadcasting band is

Which mode of propagation is used by short wave broadcast services ?.

The mode of propagation used by short wave broadcast services is

The mode of propagation used by short wave broadcast services 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 ?

Assertion: The surface wave propagation is used for medium wave band and for television broadcasting. Reason: The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere.