the transmission media can be

Explanation

Given, f=660kHz, d=5mile, First determine the wavelength of the 600kHz signal using,`f lambda=c`,Use 186000 mile per second as the spped of light since the line length is given in mile and no figure is given for the velocity factor.Substitution numerical values`600xx10^(3)lambda=186000`,`lambda=(186000)/(600xx10^(3))=0.31`mile Knowing the wavelength of the signal and the length of the line,the number of cycle on the line can be found from 'n=(d)/(lambda)=(5)/(0.31)=16.13`