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A radar has a power of \( 1 \mathrm{~kW} \) and is operating at a frequency of \( 10 \mathrm{GHz} \). It is located on a mountain top of height \( 500 \mathrm{~m} \). The maximum distance up to which it can detect object located on the surface of the
\( \mathrm{P} \) earth (Radius of earth \( =6.4 \times 10^{6} \mathrm{~m} \) ) is :
(A) \( 40 \mathrm{~km} \)
(B) \( 64 \mathrm{~km} \)
(C) \( 80 \mathrm{~km} \)
(D) \( 16 \mathrm{~km} \)
\( \mathrm{W} \)
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