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Answer the following questions : (a) L...

Answer the following questions :
(a) Long distance radio broadcasts use short - wave bands. Why ?

Text Solution

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Long distance radio broadcast is not possible using long or medium wave bands because these waves, travelling as ground waves, can cover a maximum distance of about 200 km. When used as sky waves the short waves pass through the lower portion of the atmosphere but are reflected back from ionosphere. In this way, short waves can travel very large distances ns. and can even travel round the whole earth.
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