A radar has a power of


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 earth (Radius of earth $=6.4 \times 10^{6} \mathrm{~m}$ ) is :

  1. $40 \mathrm{~km}$

  2. 64

  3. $80 \mathrm{~km}$

  4. $16 \mathrm{~km}$

Correct Option: , 3


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