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

Statement 1: Long distance radio broadcasts use short wave bands. Statement 2: Short wavelength signals are reflected by the ionosphere.

Find the magnetic potential at a point and distance of 1m from the centre of short magnetic dipole of moment 100 Am^(2) , if line joining point to the centre of dipole makes an angle 60^(@)C with the dipole moment vector.

In BX_3,B-X distance is shortes than what is expected theoretically because (X = F, Cl Br , I)

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

Long distance short-wave radio broadcasting uses

Short distance transport of metabolites is done through