Detecting objects by radar

1. The problem statement, all variables and given/known data
A radar has power 1kW and is operating at a frequency of 10GHz. It is located on a mountain top of height 500m. The maximum distance upto which it can detect object located on the surface of the earth(Radius of earth = 6.4*10^6 m) is

2. Relevant equations

3. The attempt at a solution
I’m not sure what to do here because I’m facing this kind of problem for the first time. Can anyone suggest me some equations to start with?

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