Question

For waves A,B,C,D of frequencies 6MHz, 8MHz, 10MHz and 4MHz respectively are beamed in the same directio, to communicate via sky waves. Which one of these is likely to travel the longest distance in the ionosphere before suffereing total internal reflection?

Answer 1

Answer:

C

Explanation:

Refractive index of as medium increases with frequency e.g. for the visible spectrum

please refer attachment in between this

hence for same i and for high frequency waves (high μ), sinr and hence r is decreased i.e. bending of the waves is decreased. Hence the condition of total internal reflection is attained after travelling the longest distance in the ionosphere by the wave C having the highest frequency of 10MHz.

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