Satellite Communication Numerical Problem 5

What is the specific attenuation at 10Ghz if the rainfall rate is 30mm/h and linear vertical polarization is used (kv=0.00887 alphav=1.264 at 10 GHz) A) 0.65 dB/km B) 0.94 dB/km C) 0.78 dB/km D) 0.88dB/km