Microwave telephonic link operating at the centre frequency of 10 GHz has been established. If 4 % of this is available for microwave communication channel, then no channels can be granted. If each telephone is allotted a bandwidth of 8 kHz is  P×103 then P is

Microwave frequency used  = 10 GHz                                                       =10×109Hz                                                       =1010 HZ Total band width of channel = 4 % of  1010                                                          =4×108  HZ    Band width per channel    =8×103  HZ                             No of channels  =Total band widthBand width per channel                                                               =4×1088×103=0.5×105=50×103