. Consider a cellular system operating at 900 MHz where propagation follows the free space path loss model with variations from log normal shadowing with σ = 6 dB. Suppose that for acceptable voice quality a signal-to-noise power ratio of 15 dB is required at the mobile. Assume the base station transmits at 1 W and its antenna has a 3 dB gain. There is no antenna gain at the mobile and the receiver noise in the bandwidth of interest is -10 dBm. Find the maximum cell size so that a mobile on the cell boundary will have acceptable voice quality 90% of the time.

Write a program that asks for 'name' from the user and then asks for a number and stores the two in a dictionary (called 'the_dict') as key-value pair. the program then asks if the user wants to enter more data (more data (y/n)? ) and depending on user choice, either asks for another name-number pair or exits and stores the dictionary key, values in a list of tuples and prints the list. note: ignore the case where the name is already in the dictionary. example: name: pranshu number: 517-244-2426 more data (y/n)? y name: rich number: 517-842-5425 more data (y/n)? y name: alireza number: 517-432-5224 more data (y/n)? n [('alireza', '517-432-5224'), ('pranshu', '517-244-2426'), ('rich', '517-842-5425')]